At the moment, as far as I know, mediawiki doesn't allow many options for RSS.
Many people have had to write scripts. I think that MediaWiki should incorporate
an RSS maker that has options such as where to divide different items, what to
put in the summary, etc. I realize this would be a ginormic project to
undertake, which is why I'm setting the priority to low, so if one of the
developers is bored, feel free to do somethihng like this.