[Solved]Question about button mapping

[SNap92]

That's no frameskip button, what you're searching for is called "Unthrottle" which will run the game as fast as it can on your system, on android it does skip frames by default to counter system limitations/forced vsync.
With physical controls you can also use "Speed toggle" which applies "Alternative speed" from graphic settings, set to 0% would make it work exactly same as unthrottle, just on toggle instead of holding the button.

.....yeah but can I map it to any of my keyboard's buttons is my question and if so then how and from where?