Well, technically you can already add oversized emoticons (ones bigger than the default). But it only goes up so far until it resizes them back to the default size.
<Discrate> lol geeks are fags who sit at home on the computer without a gf and no friends except other geeks they meet on the net
------------------------------ <+Nitro> I've found that the best way to clean your keyboard without taking everything apart is by sucking it