Multi-level tagging

I am new to RT so maybe I am missing something, but a single layer tag list complicates the reporting a bit (double counting of time?)? I know there are a few ideas floating out there on this board that somewhat touch on this topic, but I didn't see any that quite dial it in like I am thinking...

It might be cleaner to have say a 3 layer deep tag scheme - e.g. A top layer of "work", a second, middle layer of "admin", and a third, sub- layer of "time management." When someone creates a tag, they specify whether its level 1 2 or 3. A 2 must be assigned to a 1 and a 3 must be assigned to a 2. Then people could choose to look at summaries at level 1, 2 ,or 3. Personally I would fund this more helpful than the currently offerred and more flexible approach of assigning multiple tags. In this scheme user would assign a level3 tag.

Perhaps a simpler approach to it would be to combine the current flat file list of tags combined with 3 tag fields for each site/app, and these fields control the hierarchy. This gives more flexibility - user could assign whatever tag they wanted at any of the 3 levels - but allows for cleaner more understandable summaries as the user can choose to view the summary based on the tags assigned at either level 1,2 , or 3.

Thanks, and keep up the good work !