I bought it for underwater use and the Canon housing doesn't have a "Print" button that is the "Alt" button in this version. I had a search in the forum and found a guy who thinks ago that there was someway to change the code to refer to one of the other buttons. I know nothing about writing/compiling code...
I have almost the same problem: underwater housing for my G11 doesn`t support wheel for manual apperture, shutter or focus setup
But long push of the Direct Print button simultaneously with left/right click on the wheel in manual firmware mode is equal to wheel turn!
CHDK helps me a lot with badpixels, informative indicators and other great capabilities, and it is a real trouble to use underwater housing without CHDK!
Please, dear builders and programmers, HELP
! I believe that it is trivial for you to make ALT button ajustable from CHDK menu (it is so for several other versions of camera as i know)!
Because source code edited once will not work with new versions of CHDK i guess...