DL pilots were more than willing to take the cabin jumpseat and did they offer the F/A's the cockpit jumpseat....no.
It is Delta policy that restricts FA's from occupying a flight deck jumpseat. In fact, FA's are not even allowed on the jumpseat during empty leg charters. So what you are in fact proposing is that ALPA negotiate the jumpseat agreement for you. Once again, not their responsibility. If you want that right, it must be negotiated. An argument for organizing.
At some carriers they have asked for a higher boarding priority over all non-revs and if a F/C or B/C seat is available when deadheading that they should be given that regardless of seniority or time of gate arrival.
I hate to break it to you but that exists at DL. Deadheading crewmembers are supposed to be upgraded prior to nonrevs based on availability.
What would I expect of union groups? I expect that they work together.
In what way? Co-negotiating? Are you suggesting pattern based bargaining? You cannot argue for either of these because you have no union.
It appears from your posts that you are not in favor of unionization, however, your posts also recommend you should do just the opposite. The one thing I agree with NBNW about regards the practice of freeloading, and that is exactly what you are condoning. A number of rights you enjoy can be attributed to the union. If you want a jumpseat, negotiate for it. Quit blaming others for not doing it for you especially when you aren't contributing.
