question for SNAFU,
When you are up wandering around the cabin is the other pilot on O2, also please try to explain how reading a USA today in cruise flight at 410 under positive control is any more unprofessional or un-safe than wondering around in the back making yourself a snack.
Assuming worse case scenario, if something happens the guy reading the paper puts it down and flies, while you would have to sprint to the front, strap in and try to figure out what is going on since you have been out of the "loop" with your situational awareness.
Not trying to throw stones just trying to follow your logic. It is unprofessional to read while sitting straped in at the controls monitoring ACT, but stretching your legs in the back to occupy your mind is OK?