Hi,
I found 3 new bugs (tested all of them in fba standalone) :
1. P2 can't join in monster maulers and its clone
2. Most games in Taito "The NewZealand Story" driver are broken (fba crash). Actually i noticed something really weird : "kabukiz" is not present in the fba arcade dat file while the game is present and marked as working in the driver.
3. In megadrive's general chaos, it seems multitap is detected, but either i don't understand how to move P2/P3/P4, or their controls are broken