We have some forms that at any given time have over 100 active forms. When we need to do maintenance on the form, it would be great if we could not allow new submissions of the forms, but still allow those that have tasks to complete their tasks.

Example, we have a field that was added to a form as a drop-down. We have since decided it would be best to populate this field doing a database lookup, but also allow them to type into the field if the database lookup comes back empty. So we want to disable new submissions, but allow the other steps in the process to complete so we can make sure that all instances are completed before making the change.