physics forces don’t work the same as gravity direction or the effect of zero gravity in UE4. I already did look at the plug-in you mentioned and here is how it works:
The creator has made a custom pawn class that contains a custom movement component in which it has a gravity system independent from what ever UE4 is doing globally.
The problem with that plugin is that anything you want to make have gravity direction must be a “custom pawn” including simple objects such as traffic cones or crates. They all must be “pawns” in this system. This problem becomes worse when you realize that it is useless when it comes to vehicles. As vehicles in UE4 cannot be inherited from this custom pawn class.