In plugins developers can specify the 'id' element. Please can you consider also allowing the 'class' element to be available?
// Plugin Form item
'field_name' => array(
'label' => T_('Label Name Goes Here),
'type' => 'text', // others available also
'id' => $this->classname.'_your_element_name',
'class' => '', // << CSS CLASS
Some Form items already has class names specified, but it would be very useful if the user defined names could be added in the class elements. I understand that it may not be commonly used, but it is useful non the less and I have encountered the need for this several times during plugin development.