non-streetbound routes?

[Andreas]

That works perfectly fine, but in that case, the points are stored as track points in the gpx file. In my understanding, track points are used for points of actually driven routes (= tracks) only, not for planned routes. Therefore, my tool today uses <rtept> for managing routes and <trkpt> for saving the effectivly driven track. But of course I can change that.

Actually, I wouldn't do that as it's fine the way you've currently implemented it. Google Maps just offers streetbound routes...

Ok. Perhaps I will implement a "RC compatibility mode" flag in the ini file for that.