I really wonder if someone would like to make a script like that, since we users have been forced for ages to use default emoticons in conversations for common expressions like smiling, laughing, feeling sorry, etc.., and, you know, those emoticons REALLY suck.
Well, I'd like to do that on my own but I don't have any knowledge nor I have time to sit down and study how to do the whole thing, so I hope someone takes my suggestion and gives it shape somehow.