Movable-type-showallauthors is a project mainly written in Perl, based on the MIT license.
For Movable Type 4.3+, transforms the list of users presented by "Show only entries where user..." from recent users to all users on the blog. Useful for large installations with lots of authors.
ShowAllAuthors uses a template parameter callback to change the list of authors (limited to 50 'recent' users) available in Manage -> Entries -> "Show only entries where user is...". Additionally, the list will contain names from bylines rather than account usernames to make sifting through a long list easier.
To install:
Tested against MT4.31