BTB, I know this thread started awhile back but I've enjoyed reading it. I've got 7 Crays now and have a list tacked to the wall with each of their names and the dates they moult. I love peering into each tank every morning to see if there was any midnight moulting going on while I was asleep
I've got a male C. quad about 6"-7" (without claws) I've had him a couple months, he's only moulted once so far.
I don't know if it's normal for them to produce eggs without a male present but I'd guess it is. Fish can lay eggs even if there's only female fish in there.