Re: rss feed and login turned on
I'm not sure of the relevance of these links:
http://daringfireball.net/2005/02/feed_authentication
and http://labs.silverorange.com/archives/2003/july/privaterss
It has a nice write up about http authenticated RSS, and a comparison of RSS readers.
Basically your users will need to be sure they are using an RSS aggregator that supports authentication. I'm not sure what authentication tikiwiki offers for RSS when in that mode, its worth a read anyway.