I bet that his insider knowledge of Space Command operations would protect him against various persons' desire to teleport him without coordinates...

It's been awhile since I saw PowerPlay, but I think the point there was to keep Zen from ordering the ship to attack Tarrant and/or Dayna, not to give them the kind of person-to-ship bond that Jenna has. I mean, there are plenty of people who wouldn't try to shoot you but who wouldn't marry (or shag) you either.