i think it sounds like we have come to some good compromise solution.
percentage match is differen from begining of filename bonus
begining of filename bonus is in the score list described as "leftmost match bonus"
sorry if i confused the issue by making it sound like they were both called "percentage match"
see help file for description of what all the heuristics do

i think i agree with the toolbar button idea - i want to add toolbar buttons for other things and i think we can spare a short row of buttons on f&r screen for such things.
i like the idea of special file-type plugins that would allow you to search specific details of files like mp3 tags.
(though i think i might just build in mp3 tag and url favorites checking and some other common ones).
so there are really 2 different kinds of plugins,
first would be file scanning plugins, like looking for mp3 tags.
the other kind would be a plugin that would react to what you type; like if you typed "dict blah" it would show you the definition of the word in the window.. im still not convinced this is really much of an improvement over the already planned command exe launching function, except that it would be faster to view.