ok, very quickly coded this, its in top right corner. It wasn't possible in the posbit section (little profile on the side of each post) since you can't have forms in forms, you will understand if you know HTML. let me know if there are any bugs/problems with it.
Works a treat. Might I suggest adding a cell spacing of one or two more than it currently is, as the box is cutting it rather close to the private messages underlined link?
Nice one man, yeah it makes lot more sense there as few people would bother to go into their user cp just to change their mood. Well done