If you embed `dired-dd-mime.el' in the dired-dd package, you can compose multi-part by simple Drag-and-Drop from dired to the draft buffer being edited in GNU Emacs (this feature is not Wanderlust specific, but general-purpose for SEMI).
;; dired-dd: http://www.asahi-net.or.jp/~pi9s-nnb/dired-dd-home.html
(add-hook
'dired-load-hook
(function
(lambda ()
(load "dired-x")
;; Set dired-x variables here.
;; To and flo...
(if window-system
(progn (require 'dired-dd)
(require 'dired-dd-mime))))))
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