How to enable and disable versioning on WCM 6

Search WCMConfigService.properties for "versioningStrategy". You can set the properties to always (enable) or never (disable)

# enable version control for the following types.
# options are always | never
versioningStrategy.AuthoringTemplate = always
versioningStrategy.Component = always
versioningStrategy.Content = always
versioningStrategy.PresentationTemplate = always
versioningStrategy.Site = always
versioningStrategy.Taxonomy = always
versioningStrategy.Workflow = always

Thanks Max Bareither for the tip!