Feature Request: Custom Faction Role Permission

[mbentity]

I'm developing an application that will access the Medieval Factions SQL database, and I would like to allow faction owners to grant their members the permission to perform actions on the faction through said application.

It would be useful if we could create custom dummy permissions for faction roles, with no interaction with the Medieval Factions code, designed solely to be queried through the database.

The current alternatives are either reusing an existing permission, which can lead to clarity issues, or reusing an entire role, which is better, but still fairly limiting.