The plugins revised it.
Version 1.2.0 is compatible with wp-2.8.
Probably it may have supported WP-MU.
I’m sorry to have kept you waiting for a long time.
I have not checked this plugin for AuthorAvatarsWidget.
The current version is not equivalent to a multiplex object.
I looked for a good method.
With next version 2.6, “wp_die” filter seems to be added.
I found it when I searched “wp_die filter” in google.
http://trac.wordpress.org/ticket/6589
(I want “$admin_dir” as well as an argument, too if possible.)