If that doesn’t fit you needs, we would recommend contacting a freelance developer.
We do not offer customization services ourselves, all our development time goes into our products, but Gravity Forms areofficial partners withCodeable, who are the #1 WordPress outsourcing service. They can provide quality development from hand-picked Gravity Forms specialists for any project size and budget. Additionally, they can also provide you with a no obligation estimate of what the project may cost up front. You can reach them via this link.
You can also post to our Community Forum Job Board, We do not vet any of the individual developers there, it is an open forum for all, but our community is certainly full of talented folks!