I didn't want to phrase it like that, but yeah :-).

I do like what Nintendo bringing this kind of controller under the public eye did culturally, of course, and far be it from me to deny anyone their games. I'd also like to point out that the "balance board" was found to compare quite favourably to some medical measuring tools costing rather a lot more. it didn't keep my attention beyond a evening with appropriate refreshments but I could see that sort of thing bringing something new to the table for inventive performers or installation artists.

 

I did try to use a few of different versions of the RealPlay ones, and that seemed to be fine. I highly doubt they made allowances for that sort of performance though as that would add costs without any real benefits. Very few people need that sort of thing; even I would be hard-pressed to come up with a use for me for that kind of number (never mind financing).

Those systems meant for motion-capturing (think animated movies) can accommodate that sort of number of wireless  controllers but those connect them all to a single computer. Those are NOT cheap.

I believe my friend Marije ( http://www.nescivi.nl ) is working on a system for wireless networked sensors. I think her system might be able to accommodate your sort of need. She was thinking of something like a intelligent swarm of sensors so 40 should be in range. Just contact her with your needs, maybe she could make some tweaks and send you a couple of boards. I can't think of much else. That kind of setup is really quite exotic.

Yours,

Kas.