I don't see much reason for this. The current system works, doesn't it? Also, polls are fixed. This means you can't add options, so the author has to wait with posting his poll until the players have had a chance to propose an alternative option. It also means you cannot change your choice, something I do quite often. Off course, I could post a message in the poll thread announcing my change of mind, but then the author has to scan all posts to get the corrected outcome, which somewhat defeats the point of turning into a poll in the first place. Lastly, one of the aspects I like most about IH is the discussion between the story-points, so I see no need to transfer this to another thread for the sake of a poll. That is just my preference, however.