G19 Backlighting for active Repeater

I saw somewhere in the forums and as an option inside ISBoxer to light up an indicator light when we are in a particular mode, like Repeater active. My G19 doesn't have spare indicator lights. The M1 is lit for my current 12 G-key. The M2 and M3 are dark as my other 24 G-keys are inactive. The MR button is stubborn and doesn't want to reconfigure. Not sure if it's wise anyway. It's meant for Macro Recording mode. I would rather, instead, to change the backlighting of the keys when I have the Repeater button toggled on. Is that possible?