i’m currently working on an easy-to-use stair design script  for rhino. the goal is to make it that fast, that it should take only about 3 clicks to build a full working 3D stairset.

1st click define the length of your stairset

2nd click tweak the extrusion via slider-controls (not even a keyboard required)

3rd click bake the thing out – DONE!

for extreme accuracy and functionality there are other sliders and toggles included to mirror and move stuff around. at least it takes about 2 mins to set up your stairs (in a relaxed work flow). best of all: NO calculating is required. the script automatically checks your stairs‘ proportions up on the current standards.
the script will soon be on available  for free download.