I currently have a 5 button mouse.
I had an idea to bind "Zeroing Up/Down" to combos such as:
Ctrl/Shift/Alt + Mouse wheel Up/Down
Ctrl/Shift/Alt + Mouse 4/5
so I can avoid pulling my hands off my mouse/movement keys to zero the grenade launchers/weapons but was currently unable to do so because mouse wheel and other mouse buttons are not registered as valid combos in addition to keyboard input. Only options for this are the predefined "Left Ctrl + Mouse 1/Mouse 2/Mouse 3".
It would be splendid if binds like this would be made possible.