I can verify that you can get gemstones in VH - got six emeralds in VH Forest on one of my alts (incidentally, twice as many as I've gotten on the other three characters I've done this with combined).

As a note: TD Air Chase is great on bosses. It does not magically turn Daggers into a good mobbing weapon. As such, I think there is still a good use for Knuckle Chase if you can get both (which I can't, at least not yet).

That said, Front S Roll seems far more revolutionary in terms of what it does for TMG gameplay. This is partly because I play with a controller and switching PA palettes in midair is very awkward, I'm sure, but... now I can use my 3 x Satellite Aim palette FAR more effectively than I could in the past, which has done very good things for my ability to sustain damage output.

Also, you forgot one important question for your FAQ:

Q: Did I really just dig up a tomato while mining?
A: No, this is all a bad dream.