Copy component to main terrain only

It is just a suggestion, your "copy component to terrain" is very useful and allow a lot of possibilities but it could be nice to be able to copy them only on main terrain without the draft.

In my case I had a NavMesh generator code that I have put on my MapMagic to copy on the terrains and run on "OnEnable". It took me a while to see that it was called two time, one for the draft and another for the main terrain.
This is not urgent but a nice plus :).