[CarpHunter]

I have a quick fix for this. Trying to make it into a plugin but no succes on that yet. Want to make it so that you can select in what forum you can enable this.

But till that is ready you can do the next edits in postbit and/or postbit_legacy templates.
NOTE: this will remove the quote button on your entire forum from the #1 post.

Find:

<if condition="$post['replylink']">
    <a href="$post[replylink]" rel="nofollow"><img src="$stylevar[imgdir_button]/<if condition="$post['forwardlink']">reply_small<else />quote</if>.gif" alt="$vbphrase[reply_with_quote]" border="0" /></a>
</if>

There are 2 options for this (both work but maybe one suits it better)

Replace with Option 1:

<if condition="$post['replylink']">
    <if condition="$post[postcount] == 1">	
    <else />
        <a href="$post[replylink]" rel="nofollow"><img src="$stylevar[imgdir_button]/<if condition="$post['forwardlink']">reply_small<else />quote</if>.gif" alt="$vbphrase[reply_with_quote]" border="0" /></a>
    </if>
</if>

This looks at the number of the post and when it's equal to 1 then the quote button is removed.

Or option 2:

<if condition="$post['replylink']">
    <if condition="$post[postcount] != 1">
        <a href="$post[replylink]" rel="nofollow"><img src="$stylevar[imgdir_button]/<if condition="$post['forwardlink']">reply_small<else />quote</if>.gif" alt="$vbphrase[reply_with_quote]" border="0" /></a>
    <else />
    </if>
</if>

This looks at the number of the post and when it's not equal to 1 then the quote button shown.

Hope this will help for now.