We have a move away clause. Mother had moved 13 times (statewide) and for some reason the courts felt compelled to give her "one more chance" to be stable. Father's strongest arguement was that the child needed to be in the same school for more then one year in a row. She needed to make some friends...
So we had written in our plan, and I think you can customize your plan however you want if parties agree;
Mother is designated as residential parent for school placement purposes for so long as, and only for so long as, she resides in the XX School District.
If the Mother should move from the XX School district, to anywhere, for any reason, the parties agree that Father shall be immediately designated as residential parent for school placement purposes, without need for a hearing before the Court.
Hope that helps.