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Point 3 is not acceptable, at least for me, so it will never happen as long as I am the "main admin" 
(and anyway I guess that most of the admins are against that).
At first the site was made for point 1. The side "moved" to point 2 "naturally" as there are many cars without a role that are still well worth mentioning.
If I add a filter for background vehicles you can get something close to the two first points together (i.e. choosing to display or not cars that do not have a role).
But then some background cars with a role but still background cars (we had few that felt in that category) are not visible in the mode showing only cars with a role.
(and anyway I guess that most of the admins are against that).At first the site was made for point 1. The side "moved" to point 2 "naturally" as there are many cars without a role that are still well worth mentioning.
If I add a filter for background vehicles you can get something close to the two first points together (i.e. choosing to display or not cars that do not have a role).
But then some background cars with a role but still background cars (we had few that felt in that category) are not visible in the mode showing only cars with a role.