Hacking the Confluence Space Directory to show all spaces. Break open the jar, go to line 99: pageSize: +AJS.params.pageSize, edit it. See below:

space-directory.js

try {
/* module-key = 'com.atlassian.confluence.plugins.confluence-space-directory:space-directory', location = 'js/space-directory.js' */
AJS.toInit(function ($) {
    var contextPath = AJS.Meta.get("context-path");

    var $spaceLabelItems = $(".space-label-item");

    var bindLabels = function () {
        $(".space-label").click(function (e) {
            $spaceLabelItems.removeClass('active-tab');
            var label = $(this);
            AJS.tabs.change($(".team-label a[data-tab-name='" + label.text() + "']"), e)
        });
    };

    var url = AJS.Meta.get("context-path") + "/rest/spacedirectory/1/search",
        pageUrl = AJS.Meta.get("context-path") + "/spacedirectory/view.action",
        userString = AJS.Meta.get("remote-user"),
        queryValue = "",
        timer;

    var getSelectedSpaceCategory = function() {
        return $(".tabs-nav").data("selected-tab");
    };

    var getActiveTabDetails = function() {
        var activeTab = $(".tabs-nav .active-tab");
        return {
            type: activeTab.parent().attr("id"),
            tabName: activeTab.find("a").data("tab-name")
        };
    };

    var saveActiveTab = function() {
        localStorage.setItem("lastSelectedSpaceDirectoryTab", JSON.stringify(getActiveTabDetails()));
    };

    var isAllTabActive = function() {
        var activeTab = getActiveTabDetails();
        return activeTab.type == "space-system-list" && activeTab.tabName == "all";
    };

    var getLastVisitedTab = function() {
        return JSON.parse(localStorage.getItem("lastSelectedSpaceDirectoryTab"));
    };

    var setActiveTab = function (tab) {
        if (tab && tab.type && tab.tabName) {
            $("#" + tab.type + " a[data-tab-name=" + tab.tabName + "]").parent().addClass("active-tab");
        } else {
            $("#space-system-list a[data-tab-name=site]").parent().addClass("active-tab");
        }
    };

    $spaceLabelItems.click(function(){
        $spaceLabelItems.removeClass('active-tab');
    });

    $("#space-search-result").paginate({
        nameSpace : "space-directory",
        url : url,
        cache: false, // Results may change for the same request
        pageUrl : pageUrl,
        getParams : function () {
            var status = "current", labels = [], type;
            if (userString && $("#favourites-toggle").hasClass("active-tab")) {
                labels = ["~" + userString + ":favourite", "~" + userString + ":favorite"];
                $("#space-search-title-bar .space-search-title").text("Favourite Spaces");
            }

            var selectedTeamLabel = $(".team-label.active-tab a");
            if (selectedTeamLabel.length > 0) {
                labels.push("team:" + selectedTeamLabel.attr("data-tab-name"));
                status = selectedTeamLabel.attr("data-status-name");
                $("#space-search-title-bar .space-search-title").text(selectedTeamLabel.text());
            }

            if (!labels.length) {
                var selectedTypeLabel = $(".space-type.active-tab a");
                if (selectedTypeLabel.length > 0) {
                    type = selectedTypeLabel.attr("data-type-name");
                    status = selectedTypeLabel.attr("data-status-name");

                    $("#space-search-title-bar .space-search-title").text(selectedTypeLabel.text());
                }

                if (!type)
                    $("#space-search-title-bar .space-search-title").text("All Spaces");
            }


            return {
                query : queryValue,
                label : labels,
                type : type,
                status : status
            }
        },
        //pageSize: +AJS.params.pageSize,
        pageSize: 10000000000000,
        startIndex: 0,
        preprocess: function(listContainer) {
            $(".no-results").addClass("hidden");
            $("#aui-message-bar").empty();
        },
        insertResults : function(response, container) {
            var spaces = response.spaces;
            var noSpaces = spaces.length == 0;

            // Do not show the no results message if we're on the all tab and there is no query string.
            // In that case, we'll already be showing the blank experience panel instead.
            $(".no-results").toggleClass("hidden", (!noSpaces || (isAllTabActive() && !queryTextBox.val())));
            $(".space-list-section").toggleClass("hidden", noSpaces);
            $("#space-directory-help").toggleClass("hidden", noSpaces);

            for (var i = 0, il = spaces.length; i < il; i++) {
                var space = spaces[i];
                var spaceItemString = AJS.template.load("space-list-item").fill({
                    spaceKey : space.key,
                    spaceName : space.name,
                    truncatedSpaceName : space.name,
                    spaceUrl : space.link[1].href,
                    logoUrl : space.logo.href
                }).fillHtml({
                    spaceDesc: space.description
                }).toString();

                var spaceItem = $(spaceItemString);

                container.append(spaceItem);

                // Load in the extra details
                var isFav = space.favourite;
                    $(".space-favourites a.icon-remove-fav", spaceItem).toggleClass("hidden", !isFav);
                    $(".space-favourites a.icon-add-fav", spaceItem).toggleClass("hidden", isFav);

                // Load categories
                var labels = space.labels.label;
                if (labels.length > 0) {
                    var labelList = $(".space-labels", spaceItem);
                    var labelsVisible = 0;
                    for (var j =0, ll = labels.length; j < ll; j++) {
                        if (labels[j].namespace == "team")
                        {
                            var labelItem = $(AJS.template.load("space-label").fill({spaceLabel : labels[j].name}).toString());

                            // Only show 3 labels
                            if (labelsVisible > 2) {
                                labelItem.addClass("hidden");
                            } else {
                                labelsVisible++;
                            }

                            $("ul", labelList).append(labelItem);
                        }
                    }

                    if (labelsVisible > 2) {
                        $("ul", labelList).append(AJS.template.load("space-label-ellipsis"));
                    }
                }
            }

            $(".space-favourites").favourites({});
            bindLabels();
        },
        handleError: function() {
            AJS.messages.error({
                body: "An error occurred while searching for spaces.",
                closeable: false
            })
        }
    });

    var selectedSpaceCategory = getSelectedSpaceCategory();
    if (selectedSpaceCategory) {
        setActiveTab({
            type: "space-labels-list",
            tabName: selectedSpaceCategory
        });
    } else {
        setActiveTab(getLastVisitedTab());
    }

    var updateList = function () {
        if (!$("#space-search-result").hasClass("updating-container")) {
            AJS.trigger("update-list.space-directory", {startIndex: 0});
        }
        saveActiveTab();
    };

    var queryTextBox = $("#space-search-query");
    // Populate the space directory list based on the selected category tab
    updateList();

    AJS.$(document).bind("tabSelect", function (e) {
        updateList();
        return AJS.stopEvent(e);
    });

    queryTextBox.keyup(function (e) {
        var queryString = $.trim(queryTextBox.val());
        if (queryTextBox.hasClass("placeholded")) {
            queryString = "";
        }

        // Don't run the search if the string is short
        if (!(/^\S{1,2}$/).test(queryString)) {
            // Perform a partial text search
            if (queryString != "") {
                var temp = queryString;
                queryString = temp + " OR " + temp + "*"
            }

            if (queryValue != queryString) {
                queryValue = queryString;
                clearTimeout(timer);

                timer = setTimeout(updateList, 200);
            }
        }
    });

    $("#space-search-form").submit(function(e) {
        var spaceItems = $("#space-list .space-list-item");
        if (!$("#space-search-result").hasClass("updating-container") && spaceItems.length == 1) {
            window.location = $(spaceItems[0]).find(".space-name a").attr("href");
            return AJS.stopEvent(e);
        }
    });

    bindLabels();
});
} catch (err) {
    if (console && console.log && console.error) {
        console.log("Error running batched script.");
        console.error(err);
    }
}