Alt key locked to "mouse mode"

[Expseeker]

Helo i know its an old topic.. but i only found very old entries about it. Well in my opinion the ALT key which can be accessed by the thumb has far too much value to be bound to a mouse toggle function. ALT+ Nearly all keys around ASDW are perfectly accessable. This option is somehow restricted. I  need to rebind Strg+ keys a way i am forced to play now.. thats not my choice. Why is this concipated that way. Thechnically there is no difference the directx Api can process all keys the same way... why is there this restriction...?