I'm not a computer guy but I do know that computer techs could hack into the OS of the 5D, they did it with the 300D with the famous russian hack. How hard would it be to hack the 5D and put MLU on the 'printer' button, or at least set the printer button to call up that CF for quick changing? Could it be done? Anyone willing to try or know someone who could?
I think it could make the 5D quite famous and put a serious smile on MR's face (and many many others).
It would invalidate the warranty but if it were a firmware hack, you could just upload the previous firmware before canon saw it....
Cummon, you people are intelligent, someone must be able to do it.
p.s. while you're at it, can you fix the 'C' mode bug?