Hi Mel 1911,
At the current time, no there is not a way to customize the OK button. However, this sounds like a really interesting scenario, and we are planning improvements in this area. Could you tell us a little bit more about the exact scenario you are talking about? Do you just want to send the user to a different page as the result of submitting the form, or is there something more you are trying to accomplish with the data that is being collected? Any details you can share would be greatly appreciated.
Thanks,
Chris