Reseting a car and making a mod

So remember a while ago making a car was a little easier. It used to be that every time you make a jbeam change ctrl+R would apply that change in-game. Now if you make a jbeam change to a vehicle, you must exit the game and wait or it to load a map and then load the car, and then you are able to see the jbeam change in-game.
Why was this changed, and is there a way to change it back?
I know it's a minor thing, but it was more convenient to wait a few seconds for the car to reload instead of restarting the map and the game

 

no every time I make a jbeam change, save it, and then go back to the game to reset the car it just has a floating license plate

 

you have to extract the zip and put your files like this

the onyx.zip is not a zip file, its a folder named onyx.zip
the ctrl r thing still works but it wont if its in a zip.