I wouldn't describe .LRN as being a configuration of OpenACS, but rather a slender set of packages on top of OpenACS. As Carl says, portals and an enhanced acs-subsite are key to providing .LRN-like capability for OpenACS proper. We'll move these out of .LRN and into OpenACS.
But there will always be pieces of .LRN that are .LRN specific and that won't appear in OpenACS proper. The homework package is a good example ...
