Define Admin Roles. CMSB Feature Request

Hi Guys,

CMSB Currently has the roles of admin, then editor, author and viewer.  I'm wondering how hard it would be to be able to define those roles ourselves?

For instance, I would create the role of "Marketing", then apply access per section as required by the marketing team. Then give individual users "Marketing" access.  I would give "Finance" access to those who need access to the order details etc.

Currently, I have to manage each user independently which get's tiresome when there's many users and I add another "section" and have to modify each of those users.