you will have to modify the plugin such as it does not work in a specific theme.
You can do so by this IF statement in the plugin.
if ($theme['tid'] != "theme id inwhich not to display sideboxes")
You really don't need a plugin for something so simple, in the
index template:
Find
{$header}
{$forums}
{$boardstats}
Replace with
{$header}
<div class="sidebar" style="float:right; width:25%;">
<table border="0" cellspacing="{$theme['borderwidth']}" cellpadding="{$theme['tablespace']}" class="tborder">
<tr>
<td class="thead">
<strong>Sidebox Title</strong>
</td>
</tr>
<tr>
<td class="trow1">
<span class="smalltext">Sidebox Content</span>
</td>
</tr>
</table>
</div>
<div class="forums" style="float:left; width:75%;">
{$forums}
{$boardstats}
</div>
Which template will add the codes? I do not understand