Saving custom quicktime export settings

I’m trying to use applescript to save custom quicktime export settings using quicktime 7 pro following the method outlined here:

My problem is that I want to export it to FLV using the adobe flash quicktime plugin (“Movie to Flash Video”). Is this possible? The applescript dictionary entry for “save export setting” command lists a handful of formats by default but is it possible to use 3rd party plugin types like the flash one? This script just errors out with an unsupported format message…

tell app “QuickTime Player”
tell first movie
save export settings for “FLV1” to file “My Volume:Export to Xyz Format”
end tell
end tell