A little off topic but not entirely and there might be some wisdom here. I had my first Ti Cycles built with a 1" threadless steerer. Threadless being the Ti Cycles default and there was enough other stuff going on with the design that I didn't take it further. (My first threadless.) Well, the work and parts are all very good but I have not yet fallen in love with threadless. Looks to little for me and it is so much faster and easier to adjust stem height to dial in fit for that day with a quill. (And a nice Pearl would look good!) I've talked to Dave Levy about cutting down the steerer and threading it. He sees no issues there.

2nd issue - the bike has speed wobble. Always there but when I was younger, stronger and more confident, not an issue. I hit 50 mph early on, close to as fast as I've ever gone. But now, much over 40 is not fun at all. So a thought I just had - would the quill have any benefit at slowing speed wobble by slightly stiffening the steerer in the middle section rather than bending it at the top? And would a stiffer steel stem perhaps improve that again?