I’m pretty sure that’s a step in a wrong direction.
We already have property values for setbelts, whereas they behave as “auto” when present. The only good thing worth doing would be to expand the functionality of the “Car Control” menu with >>seatbelt LOCK<< option - and expand the given functionality over every seatbelt present in the vehicle.
IRL, it goes like “…and everyone fasten their seatbelts!” coming from the designated driver, and it would work miracles for a single-player game like Catacysm. The only sidestep I can see here is the one considering NPC (and animal companion) interaction, ordering them to enter the vehicle being the imperative. It would mean two things:
[ul][li]Defining what exactly is “all that” Dormant mode whilst riding besides the playing character;[/li]
[li]Considering what are dangerous situations to trigger other types of behavior than Dormant, whilst driving.[/li][/ul]
A sidenote - I guess that a feature in the lines of “stay put in your seat until I say otherwise” would prevent many headaches, just like seatbelts would prevent the playing character from starting the car whilst the followers are more likely to be standing on the ground (layer) than in the car itself. (!!!)