Is it possible to create a rule that enables auto version for certain file-types? I have set cm:autoVersion to false in contentModel.xml, but would like to enable it for some kind of documents.
maybe I did not understand the question… have you tried logging in Alfresco as admin and use the "Create Rule Wizard" ? You can specify a condition like "items with a specific mime type" and add aspect "versionable" to this items, so they will be with auto version enabled.