How often have you made a stupid mistake when building a custom form (e.g. erroneous deletion of a group)?
And how often have you changed something, when customising a form, only to find that it was better the way it was before (and you now have to redo all the work to reinstate it)?
An "Undo/Redo" function in the custom form builder would save users and support personnel a huge amount of work and frustration.
Further to the above, perhaps the delete button should also be moved to the last column to avoid accidentally clicking on it when wanting to edit an item. This should be applied across all items on Air Maestro and not just the Forms Module.