NumLock can be quickly enabled or disabled using a keyboard shortcut that you define. It supports shortcuts defined as:
- Utilizing one or more modifier keys ( Command key, Control key, Option key) plus a letter, number, or F key (e.g. F6)
- You could also use the Fn Function key as a modifier plus an F key (Fn + F11)
- Does not conflict with OS X system defined shortcut. For example Command-z is default OS shortcut for undo, thus can not be used in NumLock.
It's pretty easy to determine on your own, what's allowed and what is not. Open the preferences window and click the Shortcut button. It displays the currently defined shortcut.
If you try something that's not allowed, it will either perform the system shortcut function, beep at you, or display an alert. Then revert to the previously defined shortcut.
While I don't really recommend it, you can modified the system defined shortcuts.