Hmm, maybe I should start with a request that the object called "Spiral" be renamed "Helix". What I'm calling Pitch should be constant along a helix, at least a regular one, like the handrail of a, (ahem) "spiral" stair.
Basic Shapes could include conical spirals, planar spirals, Archimedean spirals, etc., (which would have varying pitch if I understand you) but that's not part of this wish.
AC fan since v 7. Currently on AC 26 Build 5003 USA FULL Apple Silicon,. 2022 Mac Studio, 32G ram. OS X 12.6.2