Some levels ago I bought a couple crew skill mission books from the AH, used them and had my companions complete them, but I haven't seen them repop in my missions lists.
Are those books a one time deal thing?
Also, another annoyance I have with the UI that I hope will be fixed is that schematics don't show if you know them already (or if they do, I have no idea where/how). Looking at the AH for schematics, seeing one and having to go open the list of stuff you know (which closes the AH window, so you have to reopen and research after which is another annoyance) to make sure you don't already have that one learned is bothersome.
The crew skill mission consumables give missions that you only get to complete once per use, yes.