The idea of a second vote has some appeal to me, as it could mean that the setter doesn't have to make a decision, (or it could still be tied). I thought perhaps an optional second vote, but then it could be said that those using it have an advantage. Therefore I've canned that idea.
It's worth mentioning that counting the “likes” has only been used on a few occasions to “get out of jail free” as Paul says. It is not obligatory. Sometimes a coin has been flipped.
In any case, it's not as if the house is riding on it. Best to keep it flexible and not try to cover every possibility. I agree, different approaches from setters add to the interest.