This is a gripe/feature request more than a question.
I'm designing a spiral staircase, and at the bottom of the stairs the curve goes nearly straight. Of course nearly straight implies a curve with very high radius, in this case 62 000mm. The resulting helix requires a Height of 1284mm and Revolutions - 0.00626. That means the implied Pitch is ~205,000mm. The problem is the Helix feature seems to max out the Pitch at 200,000mm. When I created the feature it automatically reduced my Height to 1252mm (without alerting me) and after I discovered the problem and tried to correct that value, it immediately changes the value back to 1252.
In this case I am only slightly above the limit, so I can tweak my design a small amount so that my pitch is less than 200,000.
Still, why should there be a limit? Seems like an arbitrary and unnecessary limitation on design freedom. Why not 500,000? Are we running out of numbers after 200,000?