I can confirm that Cruis’n World 4 player works great.
I can also confirm that the outputs (race leader light) works. However , when you do a lan game, not only is there the 1/10 race leader, the screen has a new 1/num players (2/4 if in 2nd place and havr 4 racers) as well so I will have to find the memory address for that and update the lua script so the race leader light lights up when leading the other racers instead of needing to be in 1st place of every single car.
Note I did get an error when testing lan (before implementing race leader lights) below but I want to say this was when I only had some of the four racers going and since the Mame.ini points in a circle, I expect this is normal. The next time I have a party I will have to thoroughly test with friends.
Fatal error: Unimplemented op @ 8099E8: 08AD8000 (tb|=045)