As I said in my post, you need to get the setting name from the settings page. Sometimes you may hover over it and see the name ($vbulletin->options ['whatever']), but sometimes you need to look in the page source and find the form name/value. It's not the product id. This is the line you would look at as an example in the page source:
HTML Code:
<tr valign="top">
<td class="alt1"><div class="smallfont"title="$vbulletin->options['nested_quotes_enabled']">Set this to yes to enable nested quotes.</div></td>
<td class="alt1"><div id="ctrl_setting[nested_quotes_enabled]" class="smallfont" style="white-space:nowrap">
<label for="rb_1_setting[nested_quotes_enabled]_1"><input type="radio" name="setting[nested_quotes_enabled]" id="rb_1_setting[nested_quotes_enabled]_1" value="1" tabindex="1" title="name="setting[nested_quotes_enabled]" value="1"" checked="checked" />Yes</label>
<label for="rb_0_setting[nested_quotes_enabled]_1"><input type="radio" name="setting[nested_quotes_enabled]" id="rb_0_setting[nested_quotes_enabled]_1" value="0" tabindex="1" title="name="setting[nested_quotes_enabled]" value="0"" />No</label>
</div></td>
</tr>
Using that as the example, the option name is nested_quotes_enabled and you would set it to '0' to disable it. You will have to look in the page source to get this yourself though.