Hmmm...a couple of ideas:
- add the rel modifier to the A tag in $allowable_html in config.php, then manually add the rel="nofollow" when submitting news (not recommended, unless you are the only one to submit new)
- modify the modules/submit_news/index.php to insert rel="nofollow" on all a href tags with some sort of string replace (not hard in PHP). If this happens just before the SQL insert and after the HTML is checked, you shouldn't need to modify the config.php / $allowable_html.
I don't think there is a way to force the FCKeditor to force the rel=nofollow
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