Regular key on the key board I could do, what i am looking for is mouse middle key. I was hoping to have middle key for mouse look (use to DAoC when hold down middle i could look up/down rotate left/right). Form your answer I could not use moues button

Guess i have to live with what i have now (hope for later)
by the way i change my key mapping
q = rotate left (don\'t want to let go of my mouse)
e = rotate right (don\'t want to let go of my mouse)
+ = mouse look (closer to mouse since could not use middle button)