I've got a couple of suggestions to offer.
1. History with plugin usage. As far as I can see, the only stuff retained in the history (or at least displayed in the list when the search text is empty) is programs I've launched. It doesn't seem to remember, for example, the search that I just did: "define milliard". When I entered this, I chose AskOxford, so I would have expected that to appear in my history list.
2. Web searches. You've got a bunch of web searches built in, like IMDB, wikipedia, and all the dictionary sites. Is there a way I can define my own? I can think of a bunch I'd like to see (thomas.loc.gov, Microsoft knowledgebase, maybe the MSDN docs or SQL Server books online).
3. Hide on lost focus. As a recent Launchy convert, I keep expecting FARR to go away if I select another window. Could there be an option telling it to hide itself if it loses focus?
3 suggestions? Does 3 count as "a couple"?