Form display and processing module?

I am thinking about building a PHP 5 extension modeled after the PEAR module HTML_QuickForm. If such an extension could eventually become part of the PHP distribution it would greatly simplify the basic form handling tasks that PHP beginners struggle over (preserving default values, using htmlentities() before redisplaying user input, laying out form elements, etc.) The perception that HTML_QuickForm is external to PHP and not always available is a serious barrier to its adoption and use. What are folks thoughts on this? Interested in helping? Think it's redundant? Have peeves about the HTML_QuickForm API? Thanks, David