It would still be under the same rules as General Anime itself (just like En Fuego is), being another subforum there. So, it wouldn't contain any spoilers as such, except naturally spoilers for people who haven't watched some series or are lagging behind the most recent subbed episodes. But that would equal to reading the most recent discussion from any series thread, and as such wouldn't really be a spoiler technically.

Polls are kind of easy and cheap, compared to the "deep" discussion our current rules only allow, and thus might generate extra action that now is missing. Plus they would be episode independent, thus allowing people to participate even if they are late, unlike the episode threads that are heavily centered around the latest ep. Though being episode independent does not mean they would be allowed to contain spoilers (options not yet introduced in the subbed anime).