... finish creating an article (news, page, article etc.) they somehow (for example clicking a dedicated button) let know users from supervisors group, ...
Till now that is not possible yet. The rights system of WB is based on whole pages and not on sections or articles.
To delegate this job to the different modules is not userfriendly, because each of the module authors will implement his own solution and so there is no consistent workflow over all.
For sometime in the future it is planned to expand the rights system for sections and maybe entries in modules too. Then your requirements can be fulfilled.
My idea for a good workflow is:
- a editor can create and modify a new article using a defined number of modules (wysiwyg, news, topics, and more), but never he can activate his article.
- after he finished work, he can click a 'Request for activate'-button which sends a message to the admin
- the admin(s) can switch the article to 'activated' and in the same time switch the editors right to readonly, to prevent uncontrolled, additional changes.