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I was always against expanding tagtypes beyond the basics before. The only ones I see as potentially useful expansions for this specific site are circle (which... we had, didn't we? it's blue) and type of scan, perhaps, but that might be hard to categorize consistently.

But on the whole, tagtypes should be kept simple, in my opinion. Also, moe.imouto's tagging policy is relatively simple, no? Character, Series, Artist when they're known, and a *small* number of descriptive tags. As you've said before, it's not intended that we do danbooru style exhaustive tagging here.