I thought the beta had this feature, although the GPS was and still is for the most part messed up for most everyone so I guess it really doesn't.
What would make sense is if you could make multiple waypoints instead of making it just point to point. Like if you could make a loop around the U.S. if you wanted.
iirc you could set ten waypoints in the crew one.
The race around america you mention was also in the crew one, you had to complete it with four players, took around two and a half hours. Im embarressed to tell you how many times we tried and failed to get four of us over the line together for the award because of game crashing for different players at different times of the race. And I wont begin to talk about the other one where it just stuttered along and no one could go over 30 mph because it would crash the game..