It's been asked before but I don't think answered definitively: does "only two free segments" imply that one could pay for another two? Assuming Europe wasn't origin continent, of course.

Vaguely related to that question, I've had airlines let me designate the "extra" segments (designate a couple of short ones and buy coach seats) while others insist the extras must be the last, chronologically (Qantas' idea.) I don't remember anything in the file that pontificates on that, so I'd guess it's up the the airlines.