Scott, good suggestions - thanks!
In lieu of a File > Open command, I've just created two AppleScripts. One performs the Open command, the other sends Finder-selected files. As AppleScripts, they can be accessed from the Script Menu in any program without needing to open Enclose first!
Enclose AppleScripts 1.0See the read me file for details, and for how to show the Script Menu in your menubar using the AppleScript Utility program.
Sorry about the sorting - for now, try typing a few letters of the recipient you want in the little search field above the list.