VehicleSeatInfos
This is the section where you define all seats that will be used within the layout. Please note that you can already use seats defined within the layout by default (such as front seats for example).
Name
Does it really need to be explained here?
SeatBoneName
Seat dummy's name you define in the model itself. Usually seat_(d/p)side_(f/r)
ShuffleLink
This is the seat peds will shuffle to if needed/ordered. Recommended to set a seat that's in the same line, don't set it to a seat behind you.
RearSeatLink
Like the name says, seat that is behind the current seat. Leave as <RearSeatLink /> if there isn't one.
DefaultCarTask
Unknown yet.
SeatFlags
Available flags: IsFrontSeat, IsIdleSeat, NoIndirectExit, KeepOnHeadProp, DontDetachOnWorldCollision.
HairScale
Unknown yet. Most likely setting it to higher value than 0.00 scales the hair down.