I know what you mean. But if you are just re-rendering surely you can set your comp up to pick up the new files and not have to really change it at all? I know it's a pain in the arse to do animation changes at this point (and I would have given the crit earlier but I didnt really notice these things until the whole thing got put together that's when you start to notice the same animation on each plane etc.)

I know what you're going through though. One of my shots took 11 re-renders (at film res!!)

Alan