Well on a well designed 3 button mouse you should be able to use three fingers since every each one of them should fit on different button.At least thats what happens when I put my hand on my mouse.
I use A4 tech 4D+mouse.(btw. Great deal for 10 bucks)
Moving the middle finger from button to button is just to difficult FOR ME.
But anyway , even if they do know whats best for us, I believe that cutting the options is not a good way of dealing with users. So I vote for ability to make changes in everything you use. Maybe even being able to tweak the default MM in maya. Like rmb MM and other shortcut based MM that are default. With my current knowlege it apears that there is no easy way of doing it (read: without reprograming some mel scripts).
So let me hear everybody:
WE WAN'T THE OPTION TO TWEAK EVERYTHING.
p.s.
I wonder why never alias people indulge into these threads.
I bet they read at least some of this, but I've never seen someone officialy speaking for AW. Corect me if I'm wrong I only use/visit this site for two/three years (and Lumis before).
Lets check if this will work.
"Hey alias guys I bet in 5 bucks you can't click the reply button."