Would you prefer to activate the tab for a folderish document?

In that case, you can override the contribution of the workflow action tab:

<action id="TAB_ROUTE_WORKFLOW" enabled="true"

  link="/incl/tabs/current_route.xhtml" order="60" label="action.view.review"
  type="rest_document_link">
  <category>VIEW_ACTION_LIST</category>
  <filter-id>hasRelatedRouteStarted</filter-id>
</action>

A new filter should be added into this contribution to add workflow tab to folderish document. Example:

<filter id="customfilter> <rule grant="true">

    <condition>    #{currentDocument.hasFacet("Folderish")}
    </condition>
  </rule>
</filter>

Here examples of overriding action: http://blogs.nuxeo.com/development/2012/07/qa-friday-overriding-templates-extension-point-nuxeo/

I should check that it's okay for the UI : the use case could be for instance the publication of selected documents into a section. The section path would be a workflow variable.