What is the impact of changing the keypress event so that it interacts a 'level up' than the key would do natively?

A simple example, no code needed:

If I press CTRL + F , the browser automatically opens a search bar on the page.

I made that by pressing CTRL + F it would point to an input inside the system.

I want to put several other controllers, such as changing a boostrap tab with CTRL + TAB , closing a modal with ESC . open the internal help with F11 among others.

Examples:

To navigate between tabs using CTRL + SETA

  var change_tab = function () {
        var map = {37: false, 39: false, 17: false};
        $(document).keydown(function (e) {
            if (e.keyCode in map) {
                map[e.keyCode] = true;
                if (map[37] && map[17]) {
                    var $el = $('.nav.nav-tabs').find('li');
                    $el.each(function () {
                        if ($(this).hasClass('active') === true) {
                            $(this).prev('li').find('a').trigger('click');
                        }
                    });
                }
                if (map[39] && map[17]) {
                    var $el = $('.nav.nav-tabs').find('li');
                    $el.each(function () {
                        if ($(this).hasClass('active') === true) {
                            $(this).next('li').find('a').trigger('click');
                        }
                    });
                }
            }
        }).keyup(function (e) {
            if (e.keyCode in map) {
                map[e.keyCode] = false;
            }
        });
    }

To maximize a form with CTRL + F11 :

var make_full = function () {
        var map = {17: false, 122: false};
        $(document).keydown(function (e) {
            if (e.keyCode in map) {
                map[e.keyCode] = true;
                if (map[17] && map[122]) {
                    $('.fullscreen').trigger('click');
                }
            }
        }).keyup(function (e) {
            if (e.keyCode in map) {
                map[e.keyCode] = false;
            }
        });
    }

The question is simple:

• This type of practice is considered user friendly ?

• Is there a problem in replacing the browser's shortcut keys with the keys I want to interact with in my system (EX: CTRL + F to open the search)?

PS: In the case in question the target is an internal system, it is not something to be marketed, I just need whoever it is to use, can do as many things in the shortest possible time, since the system focus is