would be really nice if when viewing the "fix" we could view a very nice implementation of the diff between the fixed version and the previous, much like pastebin.com.

This really shouldn't be too difficult IMO. I will see what I can work out on my end. I know revisions give one somewhat of a way of seeing this, but I am not sure how you have implemented it. Probably not through revisions I assume, in that case it could be a bit more difficult.