I solved the issue by purchasing another front-end poster for the free posts. But while reading through the functionalities of the Wp-User Pro it makes it seem like purchasing this pro version allows the capability to create several forms that allow for different payment methods and categories. Not just multiple form layouts, kind of pointless but it is a nicer interface on the backend. You should make this more clear on the Buy Now page or possibly include these features in further versions as by the several posts on this forum seems to be a common issue.
You can set the default post category in the form posting settings. Have you missed it?
If you enable pay per post feature, it activates through out all the forms. Currently there is no way to post for free in a specific form.
Oh shit I did! Haha my bad, and ok no worries. Like I said still a great plugin and it would be cool to see the free and choosing different prices for different forms in the future as I'll be using this for several other projects in the near future.