If you separate the saving of group file and user file specifically in MySQL this will enable MULTI SERVER SUPPORT
Example table in mysql database table

factionsgroups
survivalgroups
prisongroups
pex_entities
pex_inheritance
pex_users

so when i setup the alias of database name in the config i can have factions pex look into the factionsgroup for the group permission and is saved in the pex_users
This feature will enable per server groups and a global player database
The possibilities of this feature is vast. So please think about this thanks

Your plugin is awesome!

Already asked for many, many, many times. It won't be getting added to PEX 1.x buy may make it into PEX 2.x for Sponge/Forge servers.