on many other forums i've visited, if someone votes in a poll then the whole thread is bumped to the top of the page, but it doesn't happen here. is it possible to acquire this feature as it seems very useful?

I'll look in to it, don't know if it's an option with the forum software.

I'm not sure if it's a great idea. There could be "phantom" bumping and no way to identify who voted in the poll (to bump the thread).

But I thought the system would only let you vote once...unless of course if you Juneaid

Yeah, you can only vote once ...

It can be set either way.