Hi there! o) Well, I guess no. For what you describe, the Setvar command is unlikely to be of help. But what about this: Renaming - Multi File Renaming Questions
I'd like you to try that and if that get's in the direction of what you're looking for, a persistent setnumber could easily be added. Even if that is way off from your goal, please open a new thread in the support section, so we can get into some more details there, ok? o) Thx!