I love the script as it is already but really miss some features:

• Button and selection (highlightable) method (with Shift or Ctrl like keys) for deleting individual messages.
  
• Button for updating all or individual (if selected) feeds in the inteface with some kind of progress bar for the updating.
  
• Button for saving RSS-article as html file.
  
• Option to temporary disable subscription without deleting it.
  
• Inline configuration editor.
  
• Search button using "position:fixed" CSS.
  
• Global "Mark as read" to become "Mark as unread" if all messages marked as read already.
  
• Different update intervals for various feeds (with high frequency cronjob update calls).