Deacon wrote:
One way to make it non-intrusive into game would be a poll at log in...if you play...you will see it...if you care...you will answer it. Have the login system auto-mail the answer into the server. Then each "Vote" is linked to an account.

Important update and patch messages could also be displayed with/without a poll as well.
Yup that's the best way to do it. WorldWar2Online does it that way and they've been running since 2001 so they have a bit of experience in that area.

Forum polls are a quick fix if you don't want to invest the time to do it in game but they're not as accurate and you won't get nearly as many votes.