I've seen a post a while ago where somebody mounted their APM backwards for some reason, and they were able to do it by simply flipping the sign of one of the DCM values. From 1 to -1, something like that.
I can't find the post through searching. Does anybody remember?
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Ah, nevermind, I found it. Something sparked my memory about where it was. It was in the heli section.
http://www.diydrones.com/forum/topics/apm-orientation-for-tradition...
Anyway, here it is for you multi guys, maybe somebody will want to mount their board upsidedown or something.
If you mounted it backwards, just switch where the motors plug into. If you mounted it upside down, then you need software changes.