Easy Debian (technically, this hack is now in the Easy Chroot package) uses Matan's patched matchbox WM (patch, binary, post) along with qwerty12's discovery that setting DIALOGMODE=free in /etc/osso-af-init/matchbox.defs makes the dialogs movable. I wrote a script that toggles between the "normal" Matchbox WM and DIALOGMODE setting, and the Matan/qwerty12 version. But this will be set to "normal" unless the user specifically chooses the "Toggle Movable Windows" icon from their menu.