I have a bad Frontech mouse. Nothing special. Actually I use both Index and Middle when scrolling. not uncomfortable. Its a habit. While playing online shooting games I use Index so that the middle finger is free for right click and I can scope zoom quickly if an opponent shows up. But for websites I use both. Not very aware at that time which I use or about comfort.
middle.
Usually the middle finger, but using the dpi switch with middle finger is pretty difficult rendering it useless.
middle finger, during slow- not -so- adrenalin rushing games.
and index during adrenalin rushing.
and MY FIST during quake 3 .
I use middle one while browsing web and doing work and index while playing games .
I have Logitech G300
Index Finger
*www.emotty.com/images/emoticons/846.png
I use Index for middle click..
Btw I don't use middle click at all..only when needed in some games...