Replaceable hotkey for quick ruler

First of all, I like your software, anyways I havea little request.

I have 2 mobile PCs which don't have a 3 button mouse. So I can't use the quick ruler function, since they are not capable of doing a middle mouse click. For you to understand: buying a 3 button mouse is NOT an option! Just make the hotkey replaceable like the other hotkeys, so I can replace the hotkey for the quick ruler. Since one of your colleagues told me he would already have send the request to your programmers and I need this function quite soon, please make it happen.