Allow users to create polls
A user asked for the ability to create polls in groups, blogs and forums.
This would be pretty easy to implement at the client layer, by adding "poll" and "vote" message types, where a vote message depends on a poll message, indicates one of the options in the poll message, and is signed by the voter. The client would use metadata attached to the poll message to count votes and apply rules for situations like an identity voting for multiple options (whether this is valid depends on the voting system!).
I think this feature would make the most sense for private groups. Forums don't have any limit on which identities can take part, so vote stuffing would be easy. Blogs have the same issue, and allowing subscribers to send vote messages would remove one of the nice security properties of blogs, which is that subscribers have no way to DoS a blog because only the owner can post messages.