I like the idea, I have my interact w/ target on z since I dont see a reason to bring my weapon out and put it away total waste of a good key : but I have a trackball mouse that I use and I might just put it on my scroll like yours see how I like it. But I also try to do most of my actions on the keyboard and not use the mouse as much, bad right hand and it becomes a pain in the back side to use the mouse for longs periods.