You should be able to string parameters together like
http://rssbeta.farecompare.com/rss/google-earth-network-link?departure=SAT&nofilter=trueor
http://rssbeta.farecompare.com/rss/google-earth-network-link?departure=SAT&destinations=CHI,CMH,MSP
As far as the site you link to when you click on the link - we are still working on it

)))
And we cant decide if we want to link off to the carriers site for you to try and book the fare (assuming its available) or hook up to bookingbuddy.com or a site like that...or just leave the current site as a research tool to be used in conjunction with you shopping on your favorite booking engine.
Graeme.