Hmmm going by the MAMEdb and the SNK games FBA already supports i make it 11 games plus a few Mahjongs.....
Beast Busters
Mechanized Attack
Vanguard
Gold Medalist
Lasso
Fantasy
Joyfull Road
Ozuma wars
Paddlemania
Pioneer Balloon
Satan of Saturn
Bit of trivia Beast Busters was one of Michael Jacksons favorite games the large arcade cab routinely joined him on his tours
round the world maybe he and bubbles played it
Now depending on how you feel about Wacko Jacko might have a bearing
if it ever ends up in FBA