Also, it appears that bikeroutetoaster.com is the most full-featured in terms of course creating, so you can set not just the moving speed for the virtual partner, but also the climbing speed. In addition you can set the turn warnings (the notifications I was talking about when it said to turn left/right), as well as how "early" ahead of the turn that you want to be notified. I haven't tried it myself, but will try it soon enough