hotkey.. left mouse click with keyboard button

[ilcaa]

hi, i created a menu item and noticed a trigger can be a mouse click (left, right, middle) and a modifier (ctrl, shft, alt) this is great but it limits to only 3 options.

is it possible  to use mouse key down and keyboard button (any keyboard letter) for a trigger, if so how?  if not, possible to add, seems convenient when moving mouse with right hand and able to press key with other to execute macro, menu item, toolbar, etc

let me know, thanks