Yes, these subjects could be covered in the custody part of a separation or divorce agreement , together with a mechanism for decision making regarding educational/health problems, that includes, for example, consulting and getting opinions from professionals in the relevant fields and dealing with emergency situations. It can also deal with agreement regarding the funding of any special educational or medical expenses such as private lessons, psychological counselling, orthodontic treatment etc. Finally, it can even mention which court – the family court or a religious court –the parties agree should have jurisdiction over the matter in the event that the dispute resolution mechanism set up fails.