If you and your wife are civil, then you can put in the final divorce decree what your joint decision is for choice of schools or districts.... or you can designate one of you to make that decision.  Instead of geographic restrictions or designating someone 'primary', many good coparents are options for parenting plans that simply set out a restriction for schools or school districts so that issues do not arise later.  This technique also serves to alleviate the competition for one parent being name 'primary' over the other.  Basically...whatever you agree to, you can put in the decree.