1. One can always go for mutual divorce provided both the spouses agree on it. It is done on consensus only.
2. Mutual divorce occurs when both parties not only agree on it but also on the terms and conditions regarding alimony and child custody. in such matters court does not interfere.
3. The order on maintenance and child custody happens when mutual divorce is not possible and any of the spouses go to court to seek necessary reliefs.
4. Yes, if your wife remains unmarried and without employment even after MCD she can claim maintenance.