You have to do some template editing to add the BB codes to the quickreply. In showthread_quickreply find
PHP Code:
<td><div class="imagebutton" id="cmd_wrap0_quote"><img src="$stylevar[imgdir_editor]/quote.gif" alt="$vbphrase[wrap_quote_tags]" width="21" height="20" /></div></td>
below it add
PHP Code:
<td><div class="imagebutton" id="cmd_BBCODE"><img src="$stylevar[imgdir_editor]/FILENAME.gif" alt="$vbphrase[BBCODE]" width="21" height="20" /></div></td>
Change the BBCODE and FILENAME text. The problem is that you need to know the BBCODE corresponding to the icon itself. I havn't manage to understand this yet.
If you want to add a seperator, use
PHP Code:
<td><img src="$stylevar[imgdir_editor]/separator.gif" alt="" width="6" height="20" /></td>
Hope I understod your question. :P