Ha! These modders, they always want more... It could make sense to restrict stuff by craft (no tanks in a (air)car, but you can take a parrot or a dog, so barring HWPs isn't so nice.. I guess you could make those soldier types to circumvent the issue), and it does by environments, the combination of the two would be neat, but can probably be worked around, especially with the ability of having soldier "1x1 HWPs" to enable them to get in a (air)car.