This is documentation about a configuration directive, which can be placed within Movable Type’s core configuration file,
mt-config.cgi, to customize the behavior of the system.
This configuration directive governs which text filter choices are available to end users (default setting permits all filters). A change here will affect all blogs in the system. Disallowing a filter will not effect any entry or page that already has that text filter assigned to it. However, if you create a post in markdown, save, then disallow markdown, then edit the post again, the user will be forced to select a new text filter format for the post.
Acceptable values are:
__default__(a.k.a. Convert Line Breaks)
AllowedTextFilters __default__, markdown, textile_2