It would be nice to have the ability to set a custom error message for the fields. For example, I’m using the username field for a Company Name on the form so I’d like to change the error to say “company name is required” or “Company Name is already registered”.
Also, it would be nice to have a custom validation field so I could enter a RegEx that te contents of the field needs to conform to. For example I’m using a textbox to gather a UK postcode, which are always in a specific specific format. At the moment though I cannot check that this is being adhered to.