Flexible Permissions Merged

We would like to be able to change a couple of items in permissions to improve our governance and usability e.g. 'Board Member' it would be great to be able to allow add/edit/delete for documents without giving all the persmissions afforded to 'senior executive'. Similarly we would rather restrict the ability of senior executives when it comes to agenda/minutes so that the secretary & chair can manage the flow. With regard to both of these it would be nice if it were a on/off choice vs 'hard coded' because as our board (or some members) becomes more experienced and proficient we might change it.