Please add support for more modifier keys

[lebensterben]

Currently the modifier keys supported are:

• Shift
• Ctrl
• Alt

Please consider adding support for the following modifier keys

• Super
• Hyper
• Meta
• ISO/IEC 9995 Level 3 Shift

Among them, Super is often mapped to Win key by graphical display manager. And Meta are commonly mapped to level 2 of Alt, i.e. Meta = Shift + Alt.

Hyper and Level 3 Shift are less commonly used but can be very useful to avoid conflicts of keybindings with other programs.