There isn't. But: http://news.ycombinator.com/item?id=110672

I got an expired link when I clicked submit, and when I backtracked, the form no longer contained my data. I successfully submitted a new instance of a blank application a few times (it accepted blank input.) Then I submitted my real application. Will that confuse the system?

It's already possible. I just forgot to do it there. Will fix. Edit: fixed.

Sorry, I must have changed my question while you were editing. But I do see using the back-button on the form has been fixed.

I thought we were talking about YC funding. oops.