I'd put some money into this but not for a more smilies in the dropdown but a good fully developed frontend smiley catergory solution as the dropdown menu is not the solution i think that should be expand upon. Amongst other features.
Don't mean to hijack your thread gabby but since you made a request (paid) I'm betting a few people here will help to pay for a fuller more developed smiley system if your accommodating this. If not ignore this post.