More options for push-to-talk key#320

Currently, the push-to-talk key has very limited options (e.g., Alt, Tab, Right Ctrl). While it is not completely fixed, the available choices are too restrictive.

It would be very helpful to allow assigning any key or mouse button for push-to-talk — for example Space, Middle Mouse Button, or another preferred key.

This would improve comfort and usability, especially for players using custom setups like one hand keyboards.