There's already an option to turn that dialogue box off, at least on Mac. I'm not in front of S1 right now but its in the preferences pane, perhaps in advanced. When I get back in front of it I'll check back and tell you exactly where it is on my Mac system.
On second thought, I'm referring to when you first open S1 and the "missing midi device" dialogue pops up. After re-reading your request, I believe I'm speaking of something different. My apologies.