My rig is lazer rachesis and I set side button to V and G. In game option I cannot assign any special button on mouse. Crysis1 I set V for suit menu and drag to select. It very effective.
Mouse driver is latest version and can use in window and other game.
I have a 5 button mouse. A button on either side of the mosue so I assigned my thumb one to melee, and my other side to binoculours.... When I hit melee, it ends up going into binoculours, tagging the enemy, then meleeing them....
WTF? Lol.
So yeh I don't use my 5th mouse button any more. Put binoculours back to B.