Wow, very nice work!
Currently testing it, looks and works exactly the way i imagined.

The browsing through the model folders works fast and smooth, its nice to be able to rotate the models in the preview, and very cool to flip through those models with the misc_model entity selected.
Havent encountered any problems so far.

Anything specific you might want to have tested? 

It's good to know, that it works well with your practical cases.
Just tell, if something is not working, as expected.
I'v got a few questionable points:
-loading whole VFS here (root with max depth)(120k files) takes time, perhaps it makes sense to only load on 1st browser rendering
-there are some huge models laying around here, may be should load model file 1st to avoid loading, basing on the size (this is quite rough property tho)
-treeview expands quite widely and doesn't minimize, may be there should be draggable separator to adjust width and treeview itself scrollable horizontally 

Downloads are moved to github: https://github.com/Garux/netradiant-custom/releases/latest 

Wasn't aware until now of those -pk3 and -repack functions added to q3map2. Nice. 

hey niger, can we get a dialog so we can selectively unhide hidden brushes? 

There is list of all primitives, inluding hidden, on L, though i'm unsure how much usable the list would be for this purpose, i.e. how would you determine which entry of list is what.
I'd go around of it this way:
I, unhide, add brushes to selection, I, H
or:
I, unhide, add brushes to selection, region selected

More manageable way to control visibility should be likely done via layers. 

Hellzapoppin'! Roll up yer flaps and pick up yer brass, there's a new netradiant-custom build for all you hep cats and rug cutters, and it's a gasser! Those of you who've got yer boots on will need no introduction to this editor, but if you haven't yet collared the jive, here's the bible:

- It's hip.
- It's not for squares.
- You can cop it here:
https://github.com/Garux/netradiant-custom/releases