It depends on what keyboard you're using it on. If it's one of the mass produces keybaords (CM, Razer, Corsair etc.) then your only hope is that it already has that feature by default or you get a after market micro controller that works with your keyboard's PCB. If it's a custom build keyboard then it's dependent on the software used to power it. So basically, no. It's not as simple as changing out the diodes for leds (which are still diodes btw).