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Tags for tags would mean a wider and more creative use of tagging.
Just a thought there.
There's a cheap-and-dirty way to do this with the tag system that's in place...
Let's say you wanted to group a set of tags as "location" tags. You could then use "location-office", "location-loaned out", "location-home-bedroom", "location-home-kitchen". If you then wanted to find all of the books you had at home, for instance, you would do a tag search for "location-home*".
If that's not what you're after then please ignore the interruption. :)
If it isn't it should be.
It is a way of tagging tags, and helping one to organise them. I find it helps me be a bit more free in my tagging, as I know I can bundle-up any unbundled tags later just by looking at my list of unbundled tags.
I think the best way of seeing how this works is to use del.icio.us for a bit, and see if it suits you. I would certainly find it a great way to manage tags in librarything.
I hope you mean that you 'd be able to bundle your tags for your purposes--only for you, that is.
Taking e.g. your "roman" example : the latter is i.a. Dutch (as well as French etc.) for (en) "novel", while Dutch language "novelle" stands for i.a. (en) "tale, short story, novella, novelette".
I don't think there is anything wrong with being able to combine and interlink your proper tags--as long as this leaves those of others in peace.
I suppose it would work best if the power edit allowed you to search on multiple tags at once - and I'm not sure if it does.
Just to be clear, I am suggesting functionality in one's personal view. I'm not sure whether sharing bundles with other users would really be useful, but for managing one's own categories and tags, I think it would be great.