What you want to achieve can be done by modifying the AnyContentWorkflow. I have prepared a blog post on the subject and will do my best to make is available on www.Sitefinity.com as quickly as possible.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items