None that I'm aware of. Certainly not in Premiere Elements.
The nature off video is that it's added to a project, effects are added to it and then a new video is output. (Unlike photos, in which the original files are changed.) Because of that nature, batch changing video clips isn't really available -- even with a high-end program like After Effects.
Actually Premiere seems to handle video that's been reversed using Time Stretch better than I'd thought, so maybe I don't need to reverse it all first.