You can of course have mix of bound and unbound forms if you add a sub_form or two but this will still probably need some coding to automate and join any relationships between forms (if required). Also, a 'bound' form can have a mix of controls of bound (to a field) and unbound (no data values) items to provide a smoother interface that would otherwise be too clumsy by design to stick with just the one type.
You have definitely been through number of form filling request especially in the forms and membership sites. Most of the web sites store some personal information about the users. When operating your own web business you must have thought of doing so. Its very true that forming these forms is boring and time consuming. But what about creating these web form templates? Does it take huge time to create professional templates for your users? Well, the answer is definitely_ NO.