Preview Edit mode, using existing list item, like InfoPath preview
When previewing a changed form in the designer there is no way to test the change with an existing list item (as is possible with InfoPath). Instead we have to Publish-and-See. The addition of this feature on InfoPath 2007, shortened form development considerably.
I think the same feature on Nintex forms would really help your form developers, too.
Otherwise, really, the Edit mode preview is only testing the display/edit/new mode rules - nothing else. A real waste.
Thanks for your suggestion.
I will update the ticket if we have anything to share on this idea.