Indeed I am learning that fast! The elevation changes are sudden and swift, so I gotta down the cassette quickly. When I had a trike, all the rage was IGH's and DL-less front drives like Schlumpf or Pattersons. I don't see much mention of them here in bikes. Perhaps cause you start off with a $3k trike, adding another $1.5 in drivetrain is not that big a deal.

I'd love a Nuvinci on the rear since you can change gears both quickly and at a stop. I don't see that happening anytime soon, however.