external_acl_type and tos

Hello there..

since we know rep_mime_type only usable with http_reply_access directive,
i'm thinking about how to use external_acl_type. but i'm completely don't
know how to achieve this.

how to use external_acl_type to mark content type
^application/x-shockwave-flash? i have spent many times to looking for this
feature but i didn't find it out.

i'm very appreciated for your help.