Why just stop at flight crew? I am not "door" qualified if I am sitting in 1C or 25D, but I bet I can get the door open if needed. I have been called on to sit in an exit row during an emergency (along with the rest of the nonrevs) to handle the overwing exits if needed. I have a passport and would have no problem with being CASS qualified. If I needed to go to a day class (on my own time even) to get "door qualified" I'd be willing to do that to have the "extra" seats available for me (after all "official" crew of course".
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An empty jumpseat is a terrible thing to waste.
I know its a perk for the flight crews, but if someone else could be qualified to ride jumpseat, why restrict the priviledge other than to have one up? Remember, I am going to be more senior to your spouse or mom flying nonrev if you arent with them. Wouldnt they like an "extra" seat to play with when it comes time to clear?