Well as long as I am flying with someone with a sense of humour, I will do my best to challenge my new FO's, by that, I'm not talking about making them look bad. Just the other day (APU inop) I let the FO do the engine start, doing all the ground coordination, engine starting, everything went fine, maybe not SOP, but I think he will better understand his job with a role reversal from time to time. I know there will be many that disagree, my position is not as a trainer.