Extends mousetrap.js to add pause/unpause support. Just include this js after mousetrap.

mousetrap-pause.js

/**
 * adds a pause and unpause method to Mousetrap
 * this allows you to enable or disable keyboard shortcuts
 * without having to reset Mousetrap and rebind everything
 */
Mousetrap = (function(Mousetrap) {
    var self = Mousetrap,
        _original_stop_callback = self.stopCallback,
        enabled = true;

    self.stopCallback = function(e, element) {
        if (!enabled) {
            return true;
        }

        return _original_stop_callback(e, element);
    };

    self.pause = function() {
        enabled = false;
    };

    self.unpause = function() {
        enabled = true;
    };

    return self;
}) (Mousetrap);

mousetrap-pause.min.js

Mousetrap=function(a){var c=a.stopCallback,b=!0;a.stopCallback=function(a,d){return!b?!0:c(a,d)};a.pause=function(){b=!1};a.unpause=function(){b=!0};return a}(Mousetrap);