I think that its not possible right now, but I try.
After joining 2 DVDs to one, I replaced the new brown "Join-Menu from DVDRemake" (=Diskrootmenu = DRM) with my own one.
After that I add a new button on each original DVD-menu as a jump backwards to the DRM to play the other movie.
The backward jump buttons are working fine, but the problem is:
You cant see them.
So is there a way to add a text somehow behind the button saying for example "Rootmenu" or sth else. Otherwise a little gif in the back or sth else?
Thanks in advance for your advice.