Yeah, I've seen this requested in the Ideascale and in one of the Helix threads. Seems like a no-brainer. If I could ideal in the amps at my levels each time it would work perfectly.
That said, the Bias Amp Head is a great gadget. I had a Kemper awhile back, and though the tones can't be beaten, it just didn't behave like an amp through my guitar cab. The Bias Amp Head is like having countless real amp heads at your fingertips. The Helix does as well, but like I said, the levels are all over the place.