I'm not sure how I feel about self-editing, but just because I am an editor in my day job, a thought occurred to me:

I wonder if it might be possible to enable self-editing in revision mode -- with crossouts and insertions -- such that the "warts and all" atmosphere stays more-or-less intact and nobody gets to be a revisionist, but posters have an opportunity to demonstrate changes of heart, correct belatedly spotted typos, etc.

If that's even possible with the input technology we're using...