It would be nice if it was possible to add props to maps using prefabs, just like in scenearios, but without the race and objective etc. Ex. if you select a map it should let you load a prefab not unlike you load different 'editions' of vehicles. For example Grid Map could have the rollover test sled already there and a brick wall etc. But you know this (▶) button on the bottom right of the vehicle picture on the vehicle selector, if you press that on the level selector it will load without prefabs.
That can allready be done with prefabs(AFAIK).They'd just have to make them loadable with the press of a button.
@SuperNoob05 Do you know if meshes can be included in a prefab? EDIT: nevermind, I just remembered that they can.