This is great news that the stepper feature has arrived.
My TF Sunstorm 115 has always had an intermittent weird throttle issue. Changing the idle value helped a bit but it only ever ran well just after Russell Walsh changed a piston liner and got him going when I first bought him as a scrapper!
It's laid up on the drive at the moment unstarted for months. I'm going to fire it up today and give the new feature a go if I can, and I'll report back later.