ANTI-DOUBLEPOST SAFETY

Could you add feature that will act as anti-doublepost safety? E.g. so users is unable to post two times sane post (like when he/she clicks several times Submit button or if he/she has sloppy connection that tries to send data to RMN servers several times).

So we won't have something like this:

User (2012-08-08 12:21:53)
So how about it?
User (2012-08-08 12:21:57)
So how about it?
User (2012-08-08 12:22:02)
So how about it?

Mind you, that actual ability to double post, if content is different, shouldn't be taken, especially when author wants to bump topic if no one replied and he/she was waiting for replies, or if author of last post has new info to share about subject.