Logout during content addition

Is it possible to force an automatic logout when a user is adding content? On the particular site I'm working on, I am more concerned about security than losing work.

The module works great when a user is not creating content. However if they are in the process of adding a node, it will constantly start a new session rather than logging them out, keeping them logged in indefinitely. (I understand this is the default behavior, by design.) I tried setting the Browser Refresh Delta to 10, but it did not help.