I had a Marshall Valvestate combo and it sucked so bad compared to the Engl Savage 120 I bought right afterwards ... and the tone on the Meshuggah medley sounds like bad POD to me ...
These guys don't even charge for their sims. I think if anyone is going to make requests for them to do anything, it should be followed by a donation. Support these dudes and they'll be more likely to develop stuff you ask for!
99% of the amps you guys want could be copped with stuff that's already out there. Most of them are very similar to the "standard" amps that have already been modeled countless times. I think the only amp that's unique at this point, that hasn't really been done well, is a VHT/Fryette of some sort.