Thanks so much, Jurgen! This is exactly the kind of information I was looking for. And since the documentation exists already, how difficult it is to copy-paste it to the finder website (at least in English)?
I still hope to get an "official answer" as well (hence not closing the discussion yet). Just last year we spent days doing some Basis voodoo, enhancement activation, BADI implementations, etc. to get one QM enhancement up and running only to find out that it was not at all what we expected and completely useless to us (because of a technical restriction).