This covers binding Cmd+Opt+[Arrows, F, C], which is all I use:
defaults write -g NSUserKeyEquivalents -dict-add \
"\033Window\033Move & Resize\033Left" "@~\\U2190" \
"\033Window\033Move & Resize\033Right" "@~\\U2192" \
"\033Window\033Move & Resize\033Top" "@~\\U2191" \
"\033Window\033Move & Resize\033Bottom" "@~\\U2193" \
"\033Window\033Fill" "@~F" \
"\033Window\033Center" "@~C"
Equivalent to manually binding in System Settings -> Keyboard -> Keyboard Shortcuts -> App Shortcuts