I guess it is fun to have that option on future updates :) the maps are cool and well made but having the option to build your own private park is awesome and also to share it. Sorry for asking too much for the game :)
A full map editor could be tricky and time consuming. Without going into detail, I will need to change the way I'm rendering the map and mask.
Maybe a Training Facility where you could move obstacle around to make you own setup could be possible. Not promising anything, but I will start looking into the possibility soon.