Did you try the example from the manual?
I'm not sure, but I remembered that it works quite well, and it should work with stairs as well, because it reflects how Jcl thinks it is supposed to be written...

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt