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/tag and /blog are in need of a cleanup : there are still capability checks done in tag/lib.php (which should be done in the calling scripts), some code hasn't been adjusted following the (pre-1.9) tag library changes (capabilities not taken into account, not using the api, etc.) and there are quite a few unused variables.
hmm, I thought there the tag:create is meant for adding of new tags, and that somehow the "suing" of tags is separate - the change in user profile effectively disables just using of existing tags, because add is always required, right?