yeah we really need a way to rebind this, middle mouse button is a really useful button to use in games, I would suggest making the edge peek button caps lock, significantly beter than the middle mouse button, but please let us rebind it to something else.
I found out that swapping buttons via the freeware AutoHotkey is very easy. So far it has been working in all games I tried. Due to the nature of AutoHotkey however, this is not guaranteed for all games. So it would be wise to add the functionality to VorpX quickly.