Hierarchal Select module compatability

The Hier. Select module (http://drupal.org/project/hierarchical_select) implements its own version of free-tagging by allowing users to add new tags. If you could enable Unitag to place nicely with Hier. Select, you'd be golden. Right now, Unitag seems to require standard free-tagging to be enabled, per _unitag_get_vocabularies(). If enabled for a vocab, Hier. Select turns off the free-tagging selection.

Here's the vision: Hier Select presents a very nice interface (and extensible config) for entering new tags and categorizing them. Unitag then plays a role in the "back end", allowing the admin to approve of new terms applied by users, sanitizing tags, handling related-term insertion, etc. But Unitag & Hier Select need to inter-operate.