Conditional Form Submit Button

Hello and thanks for a great plugin. I love the direction you are heading. I've tried out 1.7 beta 2 to see if it fits my needs but it still isn't quite there, so I thought I would submit a feature request (or maybe you can suggest a better solution). I need a conditional submit button. For instance, if someone checks a box based on their circumstance, I intend to make use of the new conditional notification and conditional confirmation, which is helpful, but I also need the submit button to text change so it says different words. Possible?

I know about changing the text in the submit button, but I need the text to change based on a checkbox selection.

This is a dynamic page that signs up people applying for jobs and redirects them based on cookies set in a url parameter to a job assessment. Here's a live example:

http://y-me.us/sunrise-medical

I need to add a checkbox for return visitors who already have taken the assessment and just want their job application forwarded based on their prior results. So I just need to add a checkbox that indicates they've already taken the test, then changes the submit button text from "Proceed to Questionnaire" to "Submit My Questionnaire Results" (or something like that), then that checkbox also triggers a conditional notification and conditional confirmation (a different redirect).

I hope this indicates more clearly what I need to do. Thanks!

(note my live site has older version of GF - I'm testing the beta version on a dev site that's private)