I have been spending several weeks to trying to and add a form to a Joomla! site that would update a database I had created. I found a great form plugin but it had it's own database that could not be accessed by a PHP program. Flexi Custom Code allowed me to add my own customized PHP code to a single module. I still had to contain the code to a single module and work with getting the code placed where I wanted it (i.e. outside the main content area) since it is a module. This now opens new doors since I can easily add my own PHP code to pre-constructed Joomla! templates.