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I tried that. I created a custom paper (20x20cm) with no margins at all. I then create a 200x100pt wide rectangle. I export this, with transparent background, and open the file up in Pixelmator.

The canvas size is: 212 x 108 (which is not even the correct aspect ratio anymore) and there is an transparent border around the rectangle.

This is quite frustrating. I thought about using Omnigraffle as the production tool for iPhone icons etc, but it seems to be impossible to do pixel exact exports with this.