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I work at a software company where I design the software and, once customers have seen and played with a prototype, we get full dev work done on the product. As it stands, having a customer only be able to click certain items (e.g. dropdown lists, radio buttons, etc) isn't enough for a good feel for the usability. We need them to be able to enter text too (not save, of course - at least not for the next session). As it stands, because of this, we often land up having to dev a semi-functional prototype for our test group customers to play with for decent user experience testing. Being able to have text fields where they can enter and edit text would save us a massive amount of time.