I do not understand what you mean with “force” - I guess you want to choose one folder once and every route after should be saved to same folder.
If yes, this is missing but you can give a vote for it at the top. Edit just seen it is for favorite, frim my point also valic for route folder(?)
In case you would get a zip-file with 9 routes it would be the same.
I do not know how other software are handling auch packages. You see in my screenshot, that the numbers of routes and tracks are not equal, some want only the tracks, others routes. If you have an idea, always welcome.