Just let us remap keys for whatever we want for every option with hotkeys, not your liking restricted specific ones that may work for you but not for everyone else.

For example I would like to remap "next groupy tab" to control + alt + F12, but I'm stuck with the restricted option of  WIN + whatever 

Or if I for example want to use shift + tab to switch tabs but not control + tab, so I could switch chrome tabs with control + tab instead of groupy tabs, etc

there is no reason to limit to your restricted options the hotkeys, give us the freedom of just pick whatever we want like any kind of productivity program let's us do since years ago.

You already have it implemented for some options, why not for all? Makes no sense, limits the user freedom to remap anything to our use cases.