I think it might be a good idea to add trusted seller badge option (Like a verified sign or a custom badge uploaded by the site owner/admin). This feature might encourage seller to fulfil certain requirement to become a trusted seller and create a better marketplace.
For example, in my site I put a set of requirement like they need to email me their registered business certificate, must have at least 10 approved items in store, must meet the minimum sales amount, have good customer feedback, etc.
In return, they'll get a trusted seller badge on their store profile, a custom redirect subdomain (It would be awesome if Dokan have this function too! But for now, I'll use a third party script), and auto-publish feature (that comes with Dokan).
The more trusted seller in our site, the better. Because it will ease up the admin workload.