Setting to-list group parameter automatically manually

Hi,

as having Gmane send mails on my behalf may fail and going
through relevant groups and setting the to-list group para-
meter manually prior to posting/replying collides with my
laziness, I have the following code (GPL3) in my ~/.emacs:

| (defcustom tl-check-to-list-setting-groups "gmane" "Regular expression to match on." :type 'regexp)
| (defun tl-check-to-list-setting nil
|   (if (and
|        (string-match tl-check-to-list-setting-groups gnus-newsgroup-name)
|        (not (gnus-group-get-parameter gnus-newsgroup-name 'to-list)))
|       (let
|           ((list-post-in-article (with-current-buffer gnus-original-article-buffer
| 	                           (gnus-fetch-field "list-post"))))
|         (if list-post-in-article
|             (ignore-error minibuffer-quit
|               (let ((new-to-list (replace-regexp-in-string "<mailto:\\([^>]*\\)>" "\\1" (read-string "to-list value: "
|                                               list-post-in-article) t)))
|                 (gnus-group-set-parameter gnus-newsgroup-name 'to-list new-to-list)
|                 (gnus-mailing-list-mode 1)))))))
| (add-hook 'gnus-select-article-hook 'tl-check-to-list-setting)

This will prompt me, if I'm in a Gmane group, the to-list
group parameter is not set, and the selected article has a
"List-Post" header, with a suggested to-list setting and
either set it, or, if I quit with C-g, not set it.  This
will trigger repeatedly for every article, which is fine for
me.  (The "List-Post" header needs to be manually checked as
it can be Gmane-encrypted or refer to another mailing list
in case of crossposts.)

I intend to rewrite the code and put it into a package pri-
marily for my local use (I have grown fond of them), but on
the other hand, this may be interesting for all Gnus users,
perhaps with a default of disabled.

Any opinions?

Tim