Alot of Q-SH people seem to get away with it but they are able to build their own rosters and most are very senior.
I have worked with numerous commuters and they have had no worries but it tends to pull alot of the crew down when they constantly go on and on as to how tired they are because they "commute" and HAVE to go on their rest breaks before anyone else because their "commuters". Alot of the snr crew (esp the old B707 girls) will tell you where to shove it if you whinge about commuting. Also keep inmind that it can and will build resentment amongst your crew if you make it common knowledge that you were a commuter.
So yes it is possible but keep it under wraps and don't whinge.