a Very useful OOTB feature would be to ship a Progress bar control in K2, as a consultant this is a common thing we need to implement since customer love it and it looks really good but it's overly complicated. It would be very cool if Nintex ships a control for this, with ability to easily configure it to use the Workflow Task steps as progress steps and even a custom SMO call for steps
Thank you for your feedback. We are exploring a way to include new controls easily into SmartForms, which may address your request. Stay tuned for more information, and we'll update the status of this request as projects continue.
This is highly required feature as the forms look outdated sometimes and too much detailed without this much needed feature.