membership plugin how to not use user accounts

Hi cmsb has user accounts that allow access to various admin features of cmsb. This I manage for my client. The membership plugin works with this table and I would rather the membership plugin work with a different table and keep the cmsb control separate, after all users that sign up to a section of my website have no business in the cmsb back end. Is there a way to create a table in the database that the membership plug in can use like "members" or something. This makes sense to me but obviously not to the developers of the plug in. any body out there that can help me with this??