Direct out would be great IF it sounded great.
I don't use spring reverb, so no to that.
Dual boost would be cool.
I have been debating with myself about a third channel. I think it would tax the amp too much and add weight I don't want. I switched from a 3-channel amp to a 2-channel Archon and am much happier with the right 2 channels. I could see a few ways to do a third channel, so it would be unlikely that I would get what I wanted.
2 Identical lead channels for crunch and lead (or crunch and MORE crunch), like JP2C.
HX/DA channel
Smoother, bluesier channel that cleans up better
Something Rock-ish, but less aggressive than Archon, like a Shiva Channel 2. (Not sure if PRS has a similar amp, I've only ever seen the Archon in real life, but I do have a Shiva). This plus boost and Direct out would probably get me to use the Archon as a back-up, except I'd want it to be the same size and weight, which is improbable.
Would it be too much to ask for a modular middle channel?