Requiring an option value to be selected

[gopherhockey]

How, in vBulletin, does one require an option value to be selected. With HTML forms you can just say "required" but I don't see this option available.

I have an option that is required in the newreply template. If they click to submit their message and the option value is empty I would like the post to not go through.

I don't want it to default to a value either. Its something the user has to select.

One way I found was to add something like this in the plugin code.. but is there a better way?

if (!$vbulletin->GPC['xconditions'] AND strlen($vbulletin->GPC['xconditions']) < 1)
                                {
                                        $errors[] = 'No Condition Selected.  Please select a condition below.';
                                }