I like the idea a lot.
It is planned to redo the whole ui soon-ish, as there are a few features the current ui wouldn't support.
Currently, a user defines settings for auto screenshots in general and picks the surfaces they should be applied to. In the new ui there will be a "default" setting that serves as a template as well as a new entry for every surface to screenshot, which allows setting specific settings per surface.
I think that making some sort of ruleset part if the default settings regarding whether or not nee surfaces shall be screenshotted makes perfekt sense. The bare minimum could be a checkbox that simply applies the default settings to every new surface. A more complex one would be to have a name filter with wildcards. I like the idea.
I'm just constantlyy afraid of aiming too high and creating a product that is too complex for most people that just want a 1 minute experience with the mod to get a specific thing done.