Nope, companions dont lead workshops. It was under [money], not [what companions can do] category.

Companions are suppose to (AFIAK):

- governor of towns (not really working right now, but you can put them there)

- caravan masters (trade around the world making you money and helping the economy)

- army leaders (command their own troops. You can give them soldiers or take from them. You cant give them orders right now, but probably will be able in the future like patrol my villages. You can call them to your army for free - no influence)

- gang leader (replace a gang in a town with your own villains for money)

- your party companions (bodyguards in towns, special troops on stuff like hideouts, and help with skills)

- your clan roles (quartermaster = steward helps increase party limits, etc)

- quest leaders (send them to do quests in your place)

and likely more stuff in the future