Hi and thanks for the replies.
I didn't start the thread for "boasting" in any way. I was frankly curious concerning that I've gotten lucky so many times, while I seem to read everywhere that it is "strictly forbidden".
I don't think that there are any regulatory rules in Scandinavia prohibiting jumpseat trips as such. Most of the legs I've flown have been domestic Norwegian flights, or to and fro Copenhagen (I attend college in Malmö, and thus it's most convenient to fly to EKCH).
Cheers
TH