I just hacked uc_store.module and added:
<?php
function uc_textfield($title... other stuff) {
if(is_null($title)|| other stuff....
//steve added as alignment fix.
if (!$required) { $title = ' '.$title; }
$textfield = array(
other stuff...
?>before the textfield definition in uc_textfield so that the titles would line up under one another irrespective of being required or not. Is there a better way to do this? CSS maybe? in which case, should there be required vs. non-required div wrappers?