Yeah, i'm aware of the restrictions on the Library Sharing, but since we never play both at same time i don't think that that will be any sort of issue.
So, if i understand correctly, if he would use the shared game, he would be able to register his own ETS2 MP account on that steam and i would have no issues if he would to get him self banned? If i get a conformation on this one, i'm gonna go ahead and set up a library share and let him register and do the rest.
Once again, thanks!