I believe this function has not been coded into the Stair Tool so the answer is no.
Please make a wish for this so we can vote on it and submit it for GRAPHISOFT to consider for the next version.
If you make a wish, please post its link in this thread.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac27