Many CC at BA are commuters, if only from MAN!
I have been commuting for some time and actually need to take two flights to get to LHR. It's definitely possible but takes a bit of planning, for instance book accommodation for early reports or late clearing when you can't make the flight. The only negative bit is that very few airlines accept our e-tickets, which means that you have to go to Waterside (HO) and collect paper tickets and those must have been booked at least 48 hours before.
I think you will find that many CC live all over the world. I know of some crew living in both BKK, CPT, LAD and SFO that are commuting!