Howdy
Just an idea, but how about limiting the amount of emoticons per post? it can sometimes be distracting when reading through a post with millions of emoticons, and and i can sometimes take away from the original message, that someone is trying to convey.
Also, if they where limited, it might make loads times marginally faster, and it force people to think about thier use, and using the best emoticon for that particular expression.
just an idea