Okay, I've downloaded the source anyway, I'll take a go at it because I really need it, I'll fork it to you and see if it's good enough.
Oh, by the way, it's a matter of reading and rewriting the globalUsers.yml file, not using the methods inbuilt with Permissions.
I could make it now with my knowledge but the plugin is discontinued. Sorry. Maybe you should take a look at SetRankPB's source code. It's editing the YAML files without any of PermissionsBukkit's methods.
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