I also bind my melee to the down position of the scroll wheel it is nothing more than a confort position and no way does it give any advantage.
As most have stated that the issue is with the rate of fire exploit. Now if in order to limit that exploit and do away with the scroll bind so be it. I think that would have to be a community descision. I for one would uphold it and move it to another key.
If admins are really banning for that, Man I thought we were hard core.