With the courseplay OSM Course Converter it is possible to edit the retrained with courseplay courses in retrospect.
Since the operation is not quite trivial,
we urge you to watch the linked video tutorial
and to look at the instructions on the Github page!
Courses are converted to the OSM format,
can then be edited in the free OSM editor,
and then be converted back to use in the game.
features:
Correction of existing courseplay courses in an editor by drag and drop
Change curves, remove waypoints, change speeds
easy import and export of courseplay courses in the OSM format
Deposit the pda map for better orientation possible
Note: This solution is certainly not the most user-friendly,
but it allows 1: 1 function editorial editors,
but because of closed source not everybody likes to use it.