Molesworth, it certainly is a beta. I don't think I've referred to it as a trial version, and it's not even possible to pay for it. Getting the kind of feedback you just gave is the goal at the moment.
Double-click any route segment (in the map or in the route plan window) to bring up its properties, where you can change the planned speed, altitude and wind for that segment. Not at all obvious, you're completely right.
Rest assured a help file will be forthcoming.