Proposal for "HTML_QuickForm_altselect"

A QuickForm plugin element that extends the select element and turns its options into checkboxes or radio buttons depending on whether the multiple html attribute was set or not. For extra options not listed, you can also render an 'Other' textfield.

Each of these radio buttons could've easily been created individually and then grouped together, however it integrates well into the business logic layer, is easily scalable and when creating quite a few form elements of this format it saves time.

Example usage:
http://pyrus.sourceforge.net/HTML_QuickForm_altselect.html

Package source (select from a mirror): https://sourceforge.net/project/showfiles.php?group_id=167145&package_id=191000