Can calculate the decor placement for a spiral staircase.
just input the wantet parameters such as X and Z coordinates for where the stair will be, Y start and Y stop for how tall you want it.
Type /spiral to load the addon.
When all input parameters have been typed in, push the calculate button and the buttons on the right will have each steps coordinates.
then select a decor and push the associated button on the right, and the decor will jump into place.