hm, that it only shows new thread and no reply makes it not realy useable, is this somhow configurable? It seams that this have to be done by admins . . .. could somone take a look at it?

To add a feeds for all forums could be done easily be adding the code below to the template and changing {$this forumids variable} to the right variable name
Code:
<link rel="alternate" type="application/rss+xml" title="TalkGraphics.com RSS Feed" href="external.php?type=rss2&forumids={$this forumids variable}" />