The auxilliary function pads are not connected to the anti-flicker circuit by design.
This choice was intentional because the additional lighting will reduce the effectiveness of the existing on-board anti-flicker circuit.
It is possible to modify the board by adding a jumper wire to the circuit.
Working from either end of the board, connect a wire from C- to F2-F3-F4. Add additional capacitors to the circuit as desired to provide satisfactory anti-flicker protection.
NOTE: This modification should only be done when using the DCC-Friendly control source option.
This modification will cause a short circuit when used with a DCC decoder.
It is possible to add anti-flicker protection to the additional functions of a DCC decoder equipped unit but it does require extensive modification of the board.