To do that, you'll need to edit your symbolichotkeys plist:
defaults write com.apple.symbolichotkeys AppleSymbolicHotKeys -dict-add 75 "{enabled = 0; value = { parameters = (65535, 96, 0); type = 'standard'; }; }"
defaults write com.apple.symbolichotkeys AppleSymbolicHotKeys -dict-add 76 "{enabled = 0; value = { parameters = (65535, 96, 131072); type = 'standard'; }; }"
[crarko adds: I haven't tested this one. The com.apple.symbolichotkeys.plist file is in ~/Library, and you may wish to back it up (Time Machine or otherwise) before making any changes.]

