What this does:
This allows you to specify keywords (separated by semi-colon ;) by which to filter feeds imported by feeder. Only those feeds which contain the keywords you specify in either their title or their content will be imported as threads.
What this does NOT do:
The friend I did this for wanted to filter ALL his incoming feeds by a specific list of keywords. So this addon has been made in that way. This will NOT allow you to specify keywords for each individual feed.
Hope this is useful to someone.