I've detected that Many Official BeamNG.drive maps Have started adding interiors to buildings, But Why can't you access them in walking mode? Map Triggers work like Vehicle triggers, Doors will be openable just like you open vehicle triggers. These Doors Won't Be damageable as they're part of the map though. The Walking Mode character shouldn't have as much strength as it has right now. it should have different lifting power rather than node grabber power. Instead of having superhuman strength, it should have as much power to push cars and lift props. You also shouldn't have to ctrl + left click to lift in walking mode, it should be as simple as RMB, So lifting and pushing things in walking mode is easier.
I'm pretty sure this will happen in the future, the walking mode was just added recently so a lot of stuff in it is unfinished.
