Adding Function to the nUI UnitFrames

[meli]

Alright, so I use nUI exclusively now, and I find that I want to remove dependance upon some external add ons. So...

The first item on my list is adding support to the unit frames to enable me to use buttons 3-5 on the mouse on the unit frames, ala grid, vuhdo or others.

I just started poking around in the code, and figure before I start tweaking things, I'd ask first. Any suggestions on a good starting point? nUI_Unit.lua looks like the correct place.