Class members would then create child pages with their response to the reading. Other members could respond to the responses by creating child pages. Graphics are handled by uploading to another server. I know this isn't as nice as Manila, but it was easier to implement, and allowed me to give that capabilty to my users sooner than if I had tried to roll it in. There are several macros that allow inclusion of images in a page.
Membership is local to the site, and is sysadmin controlled.
Security uses browser-based authentication rather than cookies. They can edit any page but cannot access the site administration features. Think of this as somewhere between Manila's Contributing and Managing editors. We want a little more control over this. Editors, however, can log in from anywhere.