I believe what is being asked here is for the store owner to have the ability to allow a supplier's representative log into the cart admin and modify only selected content. This would seem to be related to the "Expand modify permission to add, edit, delete" item in the roadmap.
The core of this road map item reads "Provide ability to set modify permissions for the sections with add, delete and edit privileges. This is relatevly easy to do with current set up of user_groups. Need to evaluate the demand for this with the poll first."
I would suggest no poll is needed. This is a no-brainer in terms of meeting PCI requirements to be able to limit access in various ways.
BTW - I think what is being proposed here is rather risky in that it may allow suppliers to control your content and pose significant risk to the ability to achieve optimal organic search results....
David