I think you guys are confusing the terms "jumpseating" and "non-revving"

When you jumpseat, you are considered a crew member on that flight. You have similar rights and responsibilities as the rest of the crew. That is why most places will not let you jumpseat while still in training. That is also why you can't drink while jumpseating. And remember, if you signed up for the jumpseat but got a seat in the cabin, you are still considered a jumpseater. Jumpseating does not necessarily mean you are riding on the jumpseat. It is just another level of access to available seats on the flight. In order to have access to cockpit jumpseats, you need to be part of CASS. If not, you can still jumpseat but you will only have access to seats in the cabin.

When non-revving (also called pass travel) you are just another pax. You do not have access to the cockpit. Once your butt is in that seat, you are just like any other pax. The only difference is that you were not guaranteed to be on that flight until your butt was in that seat. You are also expected to maintain a level of decor and demeanor while non-revving. Most airlines have dress codes for non-revs. So go ahead and have a drink, but don't get plastered. Non-revving is what your friends and family get to do when you get your travel benefits so make sure you educate them about your company's policies because if they get out of line it will come back to you.

Most places will let you non-rev while in training but will NOT allow you to jumpseat since you are not in the CASS system yet and more than likely have not had your background check completed.