Courseplay has some problems with the field boudaries on the Stappenbach-Map.
We propared a fix for this issue. It contains a complete set of field scans. You hav to add it uncompressed as XML to your savegame.
With this fix, you will get speed improvements while starting the map and scanning the fields and correct field definitions for your helper to work with.
In case of joining fields, you can drive with the vehicle to the field and overwrite the previous custom field scan for the new joint fields that courseplay will find for you. Drive the tractor around the field and you will see different scans and select the one most convenient for your new field configuration.
For multiplayer, I recommend you to use mogli’s AI Vehicle. It works ok in 80% of the fields. We are working on more accurate field boundaries for the next update.
I expect you to get better game experience with courseplay in this narrow and exciting stappenbach map.