Alright, so we know there's a blacklist where the stuff you don't like to see isn't shown to you. But is there an option for the reverse? Like an automatic whitelist of tags that get added after anything you search?

For example, I want anything that I search to be order:score without me having to type it out. Is there a way to do that?

re621 (topic #25872) can technically achieve this. Install the plugin, open the settings, then fill in the "Persistent Tags" field with everything you want to add/remove.

A whitelist sounds like it'd be more "This content gets through my blacklist", less an automatic search additive.