I have the zip files for Staircase_Builder and Ladder_builder (python scripts you drop into blender)... I'm sure I got them from Alcugs ages ago... posted on the forum...I've just been to see if I could find the post, but I can't (I stubled across it months ago).
Now, I'm pretty sure the guy who posted them didn't place any restictions on the files... but I'm not sure about the protocol for posting them here (they are NOT my work)...
So, if anyone wants them, I can email them to you (drop me a pm with your email address) ... or... if the mods think it's ok, I'll upload here.
It create stairs
with colliders (as seperate objects) ...and is VERY usefull, especially for spiral staircase ... I used the stair one to make the spiral staircase in Paah'kwehNew ... it's neat little tool that saves HOURS of work making them manually in Blender...
EDIT: NO, it was COBBS, not Alcugs ... I found it... here's the link to the staircase builder ... (get the one at the bottom of the page, v4). The same guys also has a ladder builder. They are only really any use to build the mesh (obviously the properties and things have changed now ... but still they make the mesh building VERY easy... The way I did it was to make the staircase in a seperate blender file...then append it into your age file... .