I currently use Formstack as a very basic ad space reservation system for our newspaper publishing company. Basically the form consists of a checklist field (along with a few other basic fields) which I enter all the ad spaces available to be sold into. When someone sells one of the spaces, they select it from the list and submit the form. Formstack has one unique feature over Gravity Forms, and that is the option to set a field to be 'Unique'.
I believe you can set certain fields to be unique in GF, such as an email field to stop the same address being submitted twice, but the difference with the Formstack feature is that when applied to checklist fields, once an option has been checked and submitted it is hidden from the list until the submission is deleted from the backend.
I would really love to be able to use GF to manage all my forms directly on my site, but this feature is really essential to me.
Is this something you would consider adding? Would it be very difficult to achieve?
Thanks in advance,