If you're going to bind additional buttons to your Naga, I'd go with Alt + 1 to Alt + =. Don't use Ctrl as this interferes with WASD as Ctrl + A toggles Ambience etc. It can also cause your character to get stuck running. Another thing I noticed, when recording the macros for Alt + 1 etc tick the box for the default 50ms delay, as this seems to improve reliability for the button presses.