Yeah, they're only 1x1 segments, they stack nicely on top of each other - there should be no problem making a bigger set, maybe with a handrail around too. With a 2x2 segment stair, you could use the roof segment as a step off.
That was just a case of saving a .x mesh into the segments folder and hacking an existing script with the .x filename and saving it as a new segment using notepad. It's like 10 minutes work in total, did'nt even UV map the stairs, that's just what the Rhino3D spat out
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Van-B
It's c**p being the only coder in the village.