Lenny, mediation is possible but voluntary. What is agreed to is whatever both spouses voluntary agree to. If there’s no agreement either party has the right to insist beis din determine the outcome. Beis Din can also rule based on their sense of a fair compromise if neither party objects in advance for beis din to rule on a compromise rather than pure halacha. Otherwise beis din uses pure Halacha to determine the outcome. Either party can insist beis din only use pure halacha to issue a verdict. The Halacha is what I described in my last comment. Both parties are required to accept the Halacha as ruled upon by beis din.
