Option to have "From" header value via a forced value

When posting to a forum (through the web), ListHandler will insert the registered user's email address into the "From" header when posting to the mailing list. This presents two problems:

1. The user's email address is exposed

2. Most mailing listservs ('mailman' in particular) are configured to only allow subscribers to post. If a user is only registered through drupal -- and not the mailing listserv -- then his posting will not appear on the mailing list. Currently, the only solution to this issue is to require users register on both the listserv and on drupal, which is rather cumbersome.

On my local install, I have hacked the listhandler module so that it always uses the Administrative email as the "From" email address (even in cases where the user is not an anonymous visitor). I then register this administrative email with the mailman listserv as a verified email address (i.e. to allow posting).

Feature request: add a 'checkbox' configuration option to ListHandler to indicate whether the Administrative email should always be used for the "From" header.