Yeah thought about that too. But the problem with that is then I have to keep checking your voting power which is server intensive (go through the blockchain's last 24 hours). I might add that as a premium service. If I knew the account wasn't voting outside of steemvoter, then I could calculate myself without checking the blockchain... however, that is unrealistic for most people that use a single account.
I think it is just best that people keep an eye on their account. It is why I added the pause/play feature.
RE: SteemVoter.com Voting Logs Are Here