Because some TV got RGB input, do you plane to add a connector to hook up signals before the "video" chip ?
This will fix the NTSC/PAL problem for some and allow a better display.
Else, designing the PCB to plug a 5 pins connector when this chip is not soldered ? (RED, GREEN, BLUE, SYNC, GND)
Best with 7 pins. (RED, GREEN, BLUE, SYNC, AUDIO, VCC, GND)