I think this too imports only when you click on update - there seems no auto update AFAIK. Read
Gregarius - A Free, Web-based Feed Aggregator - there is no word of auto import in it. If you have it open in your browser it only does refresh via AJAX - there is nothing Auto - again you will have to call that file in first place.
If you can open up a window permanently on your browser - simplest is to use refresh scripts to refresh the import page - absolutely no server coding and no cron job needed. Or Add a simple javascript to refresh page at regular intervals or write an AJAX to ping the RSS importer at set periods.
Again - there is no such thing as AUTO IMPORT - all scripts that I knew work only when a user or cron calls/initiate an action...