Yes, I have the same complaint with Fotolia. I don't do that many pix with models and I when I do I sometimes let habit take over and forget to submit the model release.
I have found out, however, that if you just leave it, the rejection for no MR is different that a "normal" rejection in that all you have to do is go back and add the release -- no re-upload -- and approval is then very quick.
It probably still counts again you in the ratio, but at least it simpler and easier then delete and resubmit from scratch.