I am requesting functionality for ListPages to hide pages that don't meet a certain rating. This would allow sites with lots of content to filter out the inevitable garbage/spam/lower quality items that get submitted. Example: using minRating=2.0 would only show pages that are rated at least 2.0 or higher.
This would be a nice compliment to the "minVotes" feature that was recently accepted at: http://feedback.wikidot.com/wish:973, as it would let us ensure that pages are only filtered out if they receive enough votes.
This seems like a really good anti-spam feature, but I don't think this will stop spam users from down-voting good content. In order to counter this, I think that there would have to be another restriction on rating (low/medium karma users cannot rate). If you have something like that to separate the good users from the bad, then this is a pretty good idea!
:)