Using Twitter Bootstrap/Font Awesome icons in Form Builder

Is there any way to set the value of a button in the forms builder to use HTML (not escaped) so that we can add icons from icon libraries to our buttons?

   $this->add(new Submit('Login', array(
        'class' => 'btn btn-success',
        'value' => 'Login <i class="fa fa-fw fa-sign-in"></i>'

If not I'll just stick to adding this element in the raw HTML.

thats awesome.

I would like to suggest you hack When you initialize di setAutoescape(false) to tag