The Rights (Permissions) that a User has been assigned for the Add-On will be the same as those assigned for the dRofus Client Program.
As an example, if a User has "Read Only" Rights for Rooms in dRofus Client, the same User will only be able to write information to Revit Add-On from dRofus Client. The user will not have permission to write information to dRofus Client from Revit Add-On.
The User will require Project Administrator Rights in dRofus, in order to be able to create new configurations, copy / rename / edit / delete existing configurations within the "Attribute configurations", as well as make changes within "Options".