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I'm okay with keeping most of the tags that you listed, Imbir, mainly for rating reasons.
underboob covers what cleavage doesn't, and we don't have a sideboob tag, which I'd delete anyways. I'll admit that cleavage is somewhat subjective, but I basically describe it as lots of boobage showing due to a low neckline.
kitsune girls are the most common, I think. Nekomimi, inumimi, bunny ears, bunny girls and animal ears cover most of the rest.
Cameltoes apply to swimsuits as well. I use this and erect nipples to make sure things are rated correctly, quickly (these belong in questionable).
I've always been a little iffy about dress, but it's common enough and you'll have to take it up with aoie. :P

Anyways, here is the list of tags I am working my way through. It used to be 40 pages, but it's shrinking slowly.
http://moe.imouto.org/tag?name=&type=0&order=date