Will there be a way to append to multiple tags at some point? So I can download Rig Exchange and Pre-Pend "RE - <rig name>" to a batch file?
If you just want to rename/append things in the file system, you might do it under Windows. I've been using TotalCommander's Renaming tool, which is spectacularly powerful, easy and fast. I believe it can manage an unlimited number of files per operation.
You can also set templates to have certain tasks automated. For example, I always move the date/hour in the filename at the end, so to have the profiles sorted by name. There are longer and shorter digit strips tho, but with TC it's a breeze to just load the right renaming template with a click.
It's a tool which comes really in handy for a lot of other applications as well tho