Sam, the wireless operators were in an ambiguous situation in that they were salaried employees of the Marconi Company but were also signed on and paid as crew members. The lift operators certainly were crew members, signed on as stewards. But the youth of some of the lift attendants and of all of the bellboys would have worked against them on the boat deck, where a burly stoker would be a better choice for manning an oar. This matter of practical choice is most obvious in Lightoller's statement that he would allow no stewardesses into boats that he was loading - they were crew members, but they would not have been useful in that situation. I daresay the same consideration would have applied to men like the wireless operators, pursers and surgeons.
The lift operators (who weren't all boys) had the same long working day as other crew members. I imagine that the lifts weren't available overnight, and that there must have been periods during the working day when only two of the three lifts in 1st Class were in use, to give the operators a chance to snatch a meal break in rotation. That would have been more of a problem in 2nd Class, with only one lift. Perhaps another steward (or one of the operators from 1st Class) would take over from time to time to provide the lift man with short breaks.