Quote - Its NOT a bug.. you need to model FOR POSER, not for your modelling application.

No, it certainly isn't a bug. I was wondering if anyone was going to actually read your post and take any notice of it.

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This has been made far more complicated than it actually is. N-gons like those end caps MIGHT render properly in Poser, but do you really want to take the chance? The old LightWave technique that I use,  and which should be able to be applied in any half decent modeller, is to cut those end cap polys out, kill the polygons but leave the points that made up the polys, in place. You then select the points one by one and create all 4 point polys, except for the top and bottom polys, which will contain 3 points. You then paste these polys back as the end caps and Poser won't be able to mess the cylinder up, because the end cap polys are now detached from the cylinder body.
If you want to merge all the points, then all you have to do is set an appropriate smoothing angle either in your modeller or in your UV mapping software. There is no technical need for adding small bevels or using any other work arounds, except of course that bevelled edges always look better.