I loaded the file and the features themselves seem to be working. I'm not sure if you're looking for bugs or things to improve but I'll make a list of things I've noticed that are specific to the SD630 model, maybe it'll help.
One problem I notice is that the shortcuts are a little off, specifically the RAW on/off shortcut. I'm not sure what ALT + +/- is , I assume that it's the left and right sides of the thumbwheel on the SD630. Anyway nothing happens what I press those. I maybe adding a shortcut for halfpress + down to toggle on RAW or fixing the ALT + whatever keys.
Also it seems like it would work smoother if all of the CHDK shortcuts were only active in ALT mode only in general. Maybe make that an optional thing?
Other than that the only problem I have is that the thumbwheel graphic that pops up overwrites the menu while your thumbing up and down, sort of makes it hard to see your choices, maybe make the CHDK menu always overlay the thumb graphic or have an option to hide it?