How would you disable links on other sites to your posts? If you don't like the links in your threads, you could unlink it so it is harder to get the url to. Just change this line (in postbit/postbit_legacy):
HTML Code:
<if condition="$show['postcount']">#<a href="showpost.php?$session[sessionurl]p=$post[postid]&postcount=$post[postcount]" target="new" rel="nofollow" id="postcount$post[postid]" name="$post[postcount]"><strong>$post[postcount]</strong></a> </if>
To:
HTML Code:
<if condition="$show['postcount']">#<strong>$post[postcount]</strong> </if>
But, like I said, you can't do anything about the links already out there on other sites.