[kh99]

Well I guess in template SHOWTHREAD you could search for 'thread tools menu' and then add something like this:

    <tr>
	<td class="vbmenu_option"><img class="inlineimg" src="$stylevar[imgdir_button]/filter.gif" alt="Show only Starters Posts" /><a href="showthread.php?t=$threadid&amp;do=filter" rel="nofollow">Show only Starters Posts</a></td>
    </tr>

Of course you want to add it in the right place (inside the table def and in between existing rows or after the last one). Also, the code above assumes you've put a filter icon image in your style button directory. You could also make a phrase for the text instead of coding it in the template if you wanted.

BTW, this will display the thread with just the thread starter's posts, but it won't 'remember' that setting - once you click on something else you'll be back to seeing all the posts.