Like other things on a CV, I think it's up to each individual to decide what he wants to put in. There is no specific rule. If you feel comfortable with adding the sim hours to your TT (and are ready to defend your case) and the airline does not state "actual flight time", go for it. I did it before (yes when I was a low time guy) & never got told off for doing so. I wouldn't exceed the max nr of sim hours you can "claim" for the purpose of the issue of an ATPL as stated in JAR-FCL 1. Say the airline asks for 500TT (no other specification) & you have 490 actual + min 10 in the sim, you should definitely apply.