Could we get a feature which is ./marry propose ?
This should be independant from the priest role.

Do you mean as an additional step, so you become engaged by using this command and later have to get married?

Or do you want to be able to just marry without a priest? This is already possible by disabling the RequirePriest config option.

Additional step,
So you can either choose to be engaged, or you can get married directly by priest.