Coinage cannot be set globally because is set through every single PCB. In some games this can be changed through DIPs, in some games through service menu like CPS2 hardware. Maybe (I didn't check this) it can be set per some systems like neo-geo multisplot.
In Europe and Japan most games require by default one pulse (one coin) to get one credit but in USA popular configuration was usually two pulses (two coins - 25 cents x2 as I remember) that's why some games for USA have default configuration set for two coins.