Pixel/aspect ratio precise picture resizing without doing math?

Does anybody know how to export pictures with precise dimensions and aspect ratio, without having to do math?
*Use case:* The task at hand...
Imagine you want to export a picture for your desktop on, let's say an iMac, (fullscreen without borders or stretching) ... the display real estate is 1680x1050.
The camera produces 3892x2586 pixels, which translates into an aspect ratio of 3:2.
Problem:
Aperture allows to export pictures for a certain dimension retaining the original aspect ratio. Exporting with a setting of "Fit within 1680x1050" will produce - however - pictures that are 1576x1050... so the screen of the iMac will not be covered entirely (unless you set it to "fill screen" in the desktop picture system setting that is).
So to get this problem solved one has to crop the image to the right aspect ratio in the first place. Unfortunately though, Aperture does not allow one to use the actual pixel values in the crop dialogue.
Thinking about how to get this problem solved, I had no better idea than to find the lowest common denominator of 1680 and 1050 to cut down those numbers to 8 by 5.
Why doesn't Aperture allow me to put any two numbers into the crop dialogue?! This restriction makes no sense to me.
Does anyone of you have a better solution for this problem or am I overlooking something?
Thanks

Hi Ian, thanks for that swift reply. Great to see that 2.1 brought this new feature as well.

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