You'd split the vertices in UVMapper.  It has an option specifically for that.

Ah, regarding "bevel"...

I think we may be talking at cross purposes here.  Bevel in the modelling sense doesn't mean an angled edge or chamfer.  It means an extra row of verts near the edges of whatever shape you're making.  It helps to force Poser into making sharp corners.  Yes, you can just get away with using the crease angle option but it's a good idea to do the model correctly in the first place.

Just as confusingly, a Bevel tool usually does create a chamfered edge.  The simplest way to do what I mean, for Wings at least, is to use the Inset command.  It's not particularly efficient because it can potentially create an inset section for every single poly but for a cube where a whole side is a single poly, it's as good as any other method.

If you take a look at any of my models where there's an angled section - the claws for example - you'll see the edges have the extra rows of polys.  It's that which keeps 'em from looking half melted. 

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