Don't save drafts that only have Tweeps. Purge drafts command.

I want to have the draft functionality turned on for those few times when I do use them, but having a draft saved everytime I start a reply and then back out of it is a bit annoying. Could a draft only be saved if some thing other than @tweepnames is in the tweet? Also, some ability to purge all drafts or drafts older than 1 day/week would be great!