I have see on Hi5 (API) Vote Manager when you vote manager with "item reward" gives you and extra stats like passive with timer (500 extra HP for 1 hour, +5% XP for 4 hours , etc..)
Edit:
Because as i can see you will not make it API on this life then make it with delay on every topsite like:
Whos voting now on Topzone , Whos voting now on Hopzone , Whos voting now on Network
it's not hard to do this change but im bored to do it right now, i think people can do it without help if they start read what they add on they source and do not just apply the patch as blind persons.