For want of better terms, "quill height" and "stem length" could both be better... but those are minor compared to getting the saddle to pedal distance fixed. Now I don't feel cramped, like riding a borrowed bike with a seat tube 8 cm too short ... which was the adjustment the TB let me make.

Plans are to find alu tubing that fits inside the handlepost, put a threadless stem atop the tubing, then some nice bars and trigger shifters. My glove size is XXL, I'm always unintentionally changing gears on short grip twist shifters.