This is awesome.

How about speed in kmh? It's not essential, because I can google, but for figuring out good ratios to spin for target TT times, I usually use kmh.

What I mean is, if I want to do a flying 200m TT in x amount of seconds, I calculate how many km per second I need, then I figure out at what gear ratio I can do that at if I spin at r number (generally 150-160) of rpm. Again, the only real suggestion I have is a dropdown for kmh/mph.