I guess the best way to gain a jumpseat ride is to firstly to ask the cabin crew for a flight deck visit, showing your licence to us as cabin crew will show that you have a bonafide interest. It's always possible someone else has asked beforehand to visit the flight deck such as a family with children, also flying time and training requirements up front my also have a bearing on your request. Asking us to pass in your documentation would probably do your case little good and may be considered by some flight deck crew as presumptious.
I think it is probably better that you are introduced by the cabin crew along with your credentials, as I think it is probably a more subtle and politer approach. I have to say I have had both people with PPLs and Air Traffic Control officers making themselves a right royal pain in the butt once they think they have waited 'long enough' for the priviledge. I am not 'taring you with the same brush' as I have obviously not met you.
Most times we have to fit visits in with the cabin service and also the flight deck crew eating.
Once on the flight deck you can present your credentials personally and build up a nice rapport with the guys/ladies at the sharp end. Who knows if you show interest and politeness they may invite you to stay for landing, but this must be their offer and not your request I would think as it may put both you and them in a potentially embarassing situation.
Good luck with both your jumpseat rides and your career