Tinkered the whole weekend without any success.
I can activate crosshair when i choose "show lightgun options" in Retroarch but whatever i select (White, Red, .. ) it does not show up.
Also i can bind the controls to whatever, does not move an inch.
With Dreamcast Games it does work, but not with Naomi, i guess it is not possible and thats it.
Waiting for furher updates;)