Create & delete custom roles and subroles in FCP X Timeline

Hi Ken,

Is there a way to delete subroles in the Role Editor? The FCP X Help says, "Create custom roles and subroles with care. Custom roles (and the names of custom roles) cannot be edited or removed from the roles list."
This seems ridiculous and should be allowed. What if you want to change or rename a subrole?

Thanks,

Phil