This would be a great feature request for @yuniar
Some of my forms have a field which tells students that they aren't allowed to submit certain forms based on previous answers (i.e. change of major form - they cannot submit if they have already applied for graduation) - Inevitably, students will submit anyway, and the blank form is then sent to all of the admins.
I currently have the first question "Have you already applied for graduation?" and a separate text block that pops up if the answer is yes. However, the submit button is still active when I would rather it not be.
It could be easy to add an additional parameter to fields which gives the user the option to "Disable Form Submission" based on a certain selection.