Hey Advisor, welcome to the clubs, both fingerfans and the clueless club. I think most of us are in the same boat. I also have two iGestures in a hope such an arrangement or some other strategy could be worked out.
At this point in time, ivanw and torben seem to be the most knowlegeble. The best resource on this is at the XMl wiki (bin/view/Main/XmlManual
as best I can tell, it should be completely possible to do what you suggest, it seems this boards are endlessly programmable, though I doubt its possible you could get the two boards to work as one, with interactivity between them. More likely you could either have two separate boards, say one for numbers and punctuation and the other for letters or stack the left side of the normal keyboard on one and the right side on the other but there wouldn't be any interactivity between them, ie - the shift key on one wouldn't affect the other and you couldn't do two handed gestures. Then again, I wouldn't be entirely surprised if that did indeed turn out to be possible. I don't think there's much that would surprise me about what these boards can be made to do.
The basic process for setting up an iGesture is to establsh each key you want: what it is or does and where it is on the board. That's a matter of writing XML code which appears to be fairly straightforward, at least as far as most languages go.
Another good source of information, at least for the time being, are the forums on the fingerworks website. They are no longer active (you can't post to them) but you can read them and there's lots and lots of information there. Hopefully somebody is saving that against the day the website is no longer up and running.
Whatever you work out, please post it so the rest of us can learn.