I thought a moderator application add-on which available to high-rank staff (forum admin, site owner etc) to review, discuss, vote and process moderator applications from forum members.
If application of a user which reviewed by staff members reach to some point or something like that he'll be automatically promoted to Moderator rank with giving secondary group as Moderator and also grant permissions to specific forum sections which user've choosed when send his application.
Choosing section part may be depends on forum categories and also we should be set a maximum count of moderators to a specific section and If It's reached to it, user won't be able to see that category to check as wanted category by him.
If application of a user which reviewed by staff members reach to some point or something like that he'll be automatically promoted to Moderator rank with giving secondary group as Moderator and also grant permissions to specific forum sections which user've choosed when send his application.
Choosing section part may be depends on forum categories and also we should be set a maximum count of moderators to a specific section and If It's reached to it, user won't be able to see that category to check as wanted category by him.