Could we allow hyphen (-) in the charset in Zend_Form_Element's filterName() function?

Or have the ability to manually set the ID of the label's HtmlTag's Decorator? It currently relies on the element's name:

// Zend_Form_Decorator_Label
// render()
        if (null !== $tag) {
            require_once 'Zend/Form/Decorator/HtmlTag.php';
            $decorator = new Zend_Form_Decorator_HtmlTag();
            $decorator->setOptions(array('tag' => $tag,
                                         'id'  => $this->getElement()->getName() . '-label'));

            $label = $decorator->render($label);
        }

May be overkill, but I want to prepend the form's id to all the element, dt, and dd ids.

Trying to achieve the following:

Email Address

But does this instead:

Email Address

I haven't had much luck with an easy work around for the label's ID. Any suggestions other than using custom decorators?