Re: bad cabins on Regent,
Actually, there are a few on the Navigator, port side forward on deck 5, numbers 602 to 628 (even only) - the ones in category G. There is a crew passageway outside these cabins, and every once in a while, somebody gets out there, to clean, wander about, who knows. Anyway, you've got to keep your eyes open and your drapes drawn. On deck 4, catagory H, the suites don't have balconies either, but I don't think there is a crew walkway there.
On the last leg of the Navigator's World Cruise in 2003, we were in 614 and some passenger managed to get out there, in his under-shorts! My wife was not a happy camper, let me tell you!