I\'m writing a product using Python Dexterity Type, and I have Title and Description, this fields come from a behavior plone.app.dexterity.be
How about using Jquery? (Since the fieldsets are using Jquery anyway)
For example to move Tags under Summary....
$('body.template-edit.portaltype-document #formfield-form-widgets-IDublinCore-subjects').insertAfter('#formfield-form-widgets-IDublinCore-description')
Note: This is a copy of my answer here