Some aspects of symmetry tool in previous versions of Poser are terribly bugged.  Most of these are fixed with Poser 8 with the current SR 2.1.

Regarding your orientation problem, you can try exporting the OBJ and re-importing it, and then loading the rig onto that, it might work.  If it was me I'd redo it, I don't like to sell sloppy work (and I really hate to BUY it).

Almost nobody actually looks in CR2s but I like to keep them neat nevertheless.  There is no particularly safe way to automate this though, and be totally sure your automation didn't trash up some necessary parameter.  Best to do - very carefully - by hand.

Poser does not care about triangle-vs-quad, although a model will usually show different phong shading depending on whether it is all quads or the quads have been triangulated (generally leave it quads).  All triangles also tends to make a really ugly UVmap template for anyone who wants to texture your model.

"Medium poly count" is pretty arbitrary; by common poser standards, I'd say 15k-30k polys.  Out there in the real world, the standards are totally different, but by Poser standards I think that's pretty commonly accepted.

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