The PDF field format options are here. http://www.formidablepro2pdf.com/format-options/
We leave the field validation to Formidable Forms, however there is a “Capitalize First Letter ” option (shown above) and a new “Capitalize All” that is not shown in the link above.
We can also add custom formats if there is something you need that is not currently available.
Let us know if you have any other questions as we remain at your service.