Just FYI, I did finally add an "Absent Friends" section at the end of the overall Meet The Cast
page. It lists names only for old cast members, but should at least let people access their bio pages (which for a few people are quite extensive). The red stars mark those who actually entered bios at some point.
The 'system' for determining who all is listed there was based simply on who I had photos of. In otherwords, if someone appeared in any photo gallery that I actually entered a cast list for (which is all of them going back through 2/17/01 at the moment) then they should be listed. Unless I completely forgot their name or something, which was certainly the case for a few people.