...What I mean to say is, shouldn't crossover be a meta tag instead of general? I admittedly don't know much about why it should, other than it being a slightly better fit, but if tags like lol_comments and multiple_images (a common way for crossovers to be tagged, mind you) can be meta, I don't see why not. Among other reasons that I'm forgetting at this moment (^^').
It's just a edit-locked tag, so I figured some inter-member discussion is a good idea first before someone more privileged considers making any changes.