So here is how to get rid of the little number without having to read everything:
Go to the front page of the forum and klick on the little check mark. You can find this symbol in the white bar above the shoutbox.
Right click on this button and choose “copy link address” and paste the link into the feed list of your program (with “Desktop Ticker”: File -> Manage Feeds …, paste the link into the bottom text field and click on “Add”)
Now you get notifications for the whole forum.
If you only want the RSS-Feed for a specific sub forum, first click on the forum you want and then copy the RSS link from that page.