This is one of the reasons I hate to jumpseat and love living at base. So tired of dealing with all the quirks CA's have.
My favorite is when you JS and the gate agent assigns you a seat. You still approach the flight deck to ask the CA for a ride out of respect and he looks at you like you are crazy for asking when you already have a seat. However the one time you don't check in with the CA when given a seat is the time you get kicked off.