Comment 9 for bug 895346

IMO, there should be a distinction between "pilot-sniped" vehicles and neutral vehicles.
Just making neutral vehicles enterable by infantry means that certain things mappers could do previously, like Hills Have Eyes-like maps and "neutral until you finish this bonus objective" wouldn't be possible.
Civilian vehicles pose similar issues. Mappers may just want them to be eye-candy, and modders may want to give them perks, like passenger space for buses.