userscript to make youtube user friendly

yt.user.js

// ==UserScript==
// @name         Youtube watch redirect
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  redirect watch pages, channel and user video listings and add some magic
// @author       Bart De Roy
// @match        https://www.youtube.com
// @match        https://www.youtube.com/*
// @homepageURL  https://gist.github.com/sharethewisdom/
// @downloadURL  https://gist.github.com/sharethewisdom/56585798273ef6a0e98e393c5c95e9c5/raw/3f7266847a61f8ee4a3e0250b5112359eb54c762/yt.user.js
// @run-at       document-idle
// @grant        none
// ==/UserScript==

(function () {
    Number.prototype.between = function(a, b) {
        var min = Math.min.apply(Math, [a, b]),
            max = Math.max.apply(Math, [a, b]);
        return this > min && this < max;
    };

    var watchflags  = '?autoplay=1&cc_load_policy=1&fs=0&modestbranding=1&rel=0',
        userflags   = '/videos?view=0&sort=p&flow=grid',
        searchflags = '/results?sp=EgIQAQ%253D%253D&q=',
        locparam, timeparam, loc, shorturl,
        w = window,
        i = 6,
        yt = "Youtube userscript: ";

    var checkRedirect = function(i) {
        setTimeout(function () {
            loc = w.location.href;
            if (loc.indexOf("watch") !== -1) {
                try {
                    locparam = loc.match(/(v=)([^#\&\?\#]*).*/);
                } catch(err){console.log(yt + 'locparam ' + e);}
                if (locparam) {
                    try {
                        timeparam = loc.match(/(\&t=)([^#\&\?\#]*).*/);
                        //calculate the timestamp in seconds
                        var timeparts = timeparam[timeparam.length-1].match(/(\d+H)?(\d+M)?(\d+S)?/i);
                        var seconds = (((parseInt(timeparts[1]) || 0) * 3600 ) +
                                       ((parseInt(timeparts[2]) || 0) * 60   ) +
                                       (parseInt(timeparts[3]) || 0));
                        if (seconds) watchflags += '&start=' + seconds.toString();
                    } catch(err){console.log(yt + 'time ' + err);}
                    w.location.replace('https://www.youtube.com/embed/' +
                                       locparam[locparam.length-1] + watchflags);
                    console.log(yt + 'redirect ' + locparam[locparam.length-1] );
                } else {
                    console.log(yt + 'redirect failed to find video id.');
                }
            }
            else if (loc.indexOf("user") !== -1) {
                if (loc.indexOf("sort") == -1) {
                    locparam = loc.match(/(user\/)([^$\/]*).*/);
                    if (locparam) {
                        w.location.replace('https://www.youtube.com/user/' +
                                           locparam[locparam.length-1] + userflags);
                        console.log(yt + 'redirect ' + locparam[locparam.length-1]);
                    } else {
                        console.log(yt + 'redirect failed to find user id.');
                    }
                }
            }
            else if (loc.indexOf("channel") !== -1) {
                if (loc.indexOf("sort") == -1) {
                    locparam = loc.match(/(channel\/)([^$\/]*).*/);
                    if (locparam) {
                        w.location.replace('https://www.youtube.com/channel/' +
                                           locparam[locparam.length-1] + userflags);
                        console.log(yt + 'redirect ' + locparam[locparam.length-1]);
                    } else {
                        console.log(yt + 'redirect failed to find channel id.');
                    }
                }
            }

            // this needs work
            else if (loc.indexOf("results?search_query=") !== -1) {
                var sessionlink = document.getElementsByClassName('filter-col')[1].getElementsByClassName('spf-link')[0].href;
                console.log(yt + sessionlink);
                if (sessionlink) {
                    w.location.replace(sessionlink);
                    console.log(yt + 'redirect video search');
                } else {
                    console.log(yt + 'redirect failed to find session link.');
                }
                //}
                //else { console.log(yt + 'video search already redirected');}
                //}, 500);
            }
            if (--i) checkRedirect(i);
        }, 100);
    };

    var setPlaybackRate = function(r,v) {
        var newrate = Math.round(r * (1 / 0.1)) / (1 / 0.1);
        v.playbackRate = newrate;
        console.log(yt + newrate);
    };

    var modEmbed = function() {
        setTimeout(function () {
            var loc = w.location.href;
            if (loc.indexOf("embed") !== -1) {
                var sn = document.title.match(/Security Now (\d+).*/);
                if (sn){
                    var snotes = {
                        tag:document.createElement('a'),
                        href:"https://www.grc.com/sn/sn-" + sn[sn.length-1] + "-notes.pdf",
                        style: "position:absolute;top:.5rem;left:1rem;color:#ccc;" +
                        "padding:.1rem .6rem;background-color:#222;font-size:1rem;" +
                        "text-decoration:none;"
                    };
                    snotes.tag.setAttribute('target', 'blank');
                    snotes.tag.setAttribute('style', snotes.style);
                    snotes.tag.setAttribute('href', snotes.href);
                    snotes.tag.innerHTML = "Security Now shownotes ep. " + sn[sn.length-1];
                    document.body.appendChild(snotes.tag);
                }
                try {
                    var player = document.getElementById("player"),
                        rate = 1;
                    player.getElementsByClassName("html5-video-player")[0].focus();
                    player.getElementsByClassName("ytp-gradient-top")[0].remove();
                    player.getElementsByClassName("ytp-chrome-top")[0].remove();
                    var vid = player.getElementsByTagName("video")[0];
                    document.addEventListener('copy', function(event){
                        try {
                            locparam = loc.match(/embed\/([^$\?]*).*/);
                        } catch(err) {
                            console.log( yt + 'copy ' + err );
                        }
                        if (locparam) {
                            shorturl = 'https://youtu.be/' + locparam[locparam.length-1];
                            console.log(yt + 'copied ' + shorturl);
                            event.clipboardData.setData('text/plain', shorturl);
                            event.preventDefault();
                        }
                    });
                    player.addEventListener("keyup", function(event){
                        switch (event.keyCode) {
                            case 27:
                                history.back();
                                break;
                            case 109:
                                rate -= 0.1;
                                if (rate.between(0,2.1)) setPlaybackRate(rate,vid);
                                break;
                            case 107:
                                rate += 0.1;
                                if (rate.between(0,2.1)) setPlaybackRate(rate,vid);
                                break;
                        }
                    }, false);
                    console.log(yt + 'player focused');
                }
                catch (e) { console.log(yt + e); }
            }
        }, 100);
    };

    w.addEventListener('spfrequest', checkRedirect, false);
    //w.addEventListener('load',       checkRedirect, false);
    //w.addEventListener('popstate',   checkRedirect, false);
    //w.addEventListener('load',       modEmbed,      false);

    modEmbed();
    checkRedirect();
})();

// todo:
//    playlist,
//    user_uploads,
//    search,
//    hotkey to disable watch page redirection (persistent options?)

// embed?listType=playlist&list=
// window.location.href.replace()

Can you make scripts that set a timer to automatically pause/stop on all Youtube embed videos? Like pause a video after X seconds!!?