Darkelegance:

Have you tried exporting the stairs steps as an object into MD and doing the sim there?   

Have it as a part of your avatar... export the figure, in the start pose, along with the stairs out of Poser, then do what you would do for a normal MD sim and have the ending posed figure plus the stairs as the morph target.  Since stairs are usually a fairly simple mesh, MD should not have any problems.  I have done seated poses in chairs with this method.  

 

For aRtBee:  One of the reasons MD is so good, is that it is VERY forgiving of poke-through.  In fact, it resolves even extreme poke-through issues quickly, whereas, as has been stated often in this forum, Poser has problems with intersecting geometries.  Yes, Poser can do simulations from other sources, and do several other things that MD can't.  But MD is a young program compared to Poser, and it is still developing.

(Yes, I am a MD fan-girl!  grin)

 

RosemaryR
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"Oh, yeah. Ooooo. Aaaaah. That's how it starts.
Then, later, there's ...running. And....screaming."