Disabled fields when editting articles on the frontend can be set per field per usergroup.
The extra toolbar is generated from the usergroups component-access. Each link is edittable, so deep-links are also possible.
extra buttons:
In the above example the button 'manual' links to a popup with a manual in HTML. So you can make custom manuals for different usergroups.
dropdown menu:
You can create custom dropdown menu's.