It would be nice if the right side modifier keys (shift, ctrl, alt, win) were recognized as separate keys from the left side keys (they are, on scancode level). This would give power users much needed additional modifier keys for shifting to new virtual desktops (using virtual machines may consume many desktops and if 10-12 are reserved for Windows already, one starts running out of modifier keys).

The user interface would grow just by one tick box because there needed to be two boxes "[ ] Left [ ] Right" which would allow also both be ticked for people who don't want to differentiate between left/right.