The tagging system I found is just text tags, but it looks like it might do the trick. It might even be better, because we can use as many tags as we want, as well as search by tag. For example, a single thread can be tagged FF7PC-98, FF7PC-Steam, FF7PSX-NTSC-U, and FF7PSX-PAL-G, if need be. The only catch would be the added importance of consistent tags.
But I'm not 100% positive I can install this without any issues, and the last thing I want to do is cause the forums to go down by accident. If I can't do this right for sure, I won't do it at all.
Also, all threads in all release sections are now properly named, to the best of my ability. Some are simply labeled [FF7PC] without mention of supported version, which is less than I'd like, but I'm not gonna download and run every single mod just to see which versions of FF7 or FF8 they work with. Hopefully mod makers will do this correctly on their own.
edit: Oh, it's easier than I thought to do message icons. I'll do that for now, and look into a true tagging system later.
edit again: No, it's not easier. THe board doesn't have write permission to add smileys, and I need it there before it can be a message icon.. :/