If you wanted to make your Poker have full LED backlighting, you would have to add LEDs to every switch AND run wires to each LED, since there are no traces going to the LED holes in the switches (except for those 7 LEDs that come stock with the Poker).
If you didn't run hookup wires to the LEDs you installed, you'll never get them to light at all.
P.S. That's why people like me and WFD charge for the WASD LED mods to Pokers.