For the real world pilots-was wondering the other day if the precautions taken against asymetrical flap extension on smaller props (don't extend flaps unless you're wings level) apply to big jets.  While I'm sure AFE is still possible, I guess I'm asking if it's okay to extend flaps while in a turn on the larger aircraft.

Yes commercial pilots do it all the time, but I believe they do not use speed brakes after flaps 15.

lol no, AFE occurs when one flap lowers at a different speed than the other, resulting in a sudden roll. Its not pilot induced!  This can be dangerous to smaller aircraft beacuse they are more susceptible to it and if it happens in a traffic pattern at lower speeds you have a problem.  Hope that clears it up.