Flying on a CO RTW reward ticket I was able to have the agent in ROR check my bag to MNL and then on to a TG flight to BKK. The ROR agent didn't seem to be phased by it at all. I'm not surprised that the EWR agents aren't keen on doing this for PAX, and I suppose they've got an out since it is within the spec according to CO Insider, but it seems like CO has all these inter-line agreements with carriers so it shouldn't be such a problem. And yet it is. Go figure.