[eluser]4ever[/eluser]
This app looks great. I've just did a quick test. For the people who likes fast solutions...
My notes...
I think that there could be option whether user wants to get output in html or in CI functions (dynamic).
Just one more idea... Maybe it would be hard, but... what if you would press the button ... "See the form" instead "build this form" and with JQuery drag&drop; user could to organize elements into Fieldsets .... And Fieldsets into Divs... Just to get a good look.