I don't use this tool yet. I'm gonna wait for the update but in the meantime, there is a simple way to turn off the numlock with the lights key. Just go to actions, select the lights key. Start recording a macro and hit Numlock once. Then stop the macro recording. Now hit the tools icon on the same tab (next to the flag) and enable "Retain original key input".
That's it. Considering your numlock key is enabled by default on system startup and your keyboard lights are already fully on, when you hit the lights key once, your keyboard lights will go off entirely. When you press 3 times more, everything will go back to normal, including the Numlock. It basically hits numlock everytime you hit the lights key so on the 2nd light setting, Numlock will be off. It's not a perfect solution but does the job for me. I use my keyboard either fully lit up or on the 1st brightness setting anyway.
It looks like this:
http://i.imgur.com/jQP7lgj.jpg
