WebForm is a very nicely done module, but (at least at first glance) it seems to lack some things that I expect to need.
Specifically, I'd like a way to specify more complex field requirements than just a boolean. For instance, what if I have a form with an e-mail address field and a telephone field, and I want the user to be required to enter at least one of the two. In other words, if they enter an e-mail address, they don't need to enter a phone number; and if they enter a phone number, they don't need to enter an e-mail address.
Is this possible with WebForm?