Your plugin looks great. I've been reading here and on the website, and I can't find the answer to this.
I gather that when field types are chosen, they have validation routines, which is great and makes sense.
I'm wondering about custom validation, such as only display a field if a particular selection is made (or the opposite, vanishing fields no longer applicable based on user selection). I have done this sort of thing with jQuery - wondering if you have anything like that built into Formidable?