[nfn]

Thanks for this Mod.
I am the one who asked for this here and here!

This is special great if you have forums that are "feed by feeds"

Here is my contribution so you don't have to add or change any query string in external.php

Go to Admin CP, Plugin & Products, Plugin Manager and Add New Plugin

Product: Exclude Forums From external.php
Hook Location: external_start
Title: Anything you want
Execution Order: 4
Plugin PHP Code: $vbulletin->GPC['excludeids'] = '1,2,3';
Plugin is Active: Yes

Note: 1,2,3 are the forum id's you want to exclude.

Done!

Installed

Thanks