I had totally forgotten about that, but based on
a request I posted, Heliotrope did a quick hack of Ajax Menu Index to control the display order of TVs in the manager (same thread). Also check
http://modxcms.com/bugs/task/444.
This thing is more than helpful to structure the input field for TVs when editing a document. I’ll write Heliotrope about this, since he never cleaned up his hack to make it into a real ressource. If not in the distro, I’d like that to be in the repository.
Sorry for this somewhat "off topic" post... I just thought I’d mention this before I forget about it again...
Edit : I installed rev 1307 and everything went fine.
Categories work great ! It sure will make working on complex website easier

The only thing which surprised me is I thought every tab (chunk, snippets...) would be categorized, not on tab categorizing all ressources.
I also run an upgrade from 0.9.2.1 to 0.9.5 on a local miror of a production website (I like to test with content, snippets, plugins and modules installed). I went good, now I’ll get down to checking what works and what does not, and report.
Last but not least, I made a quick attempt to install the new parser (Beta 2) with rev1307, but failed...