Yup, MAP + RPM will give you approximately the same result as MAF.
Not sure if any OBDII cars were equipped that way, though.
I'm not sure what that means.. The 96-00 civics all use a map sensor, and maybe all civics in general use a map sensor since it's cheaper than a maf sensor. Map sensors are generally used in cars with turbos so IIRC the volvo s60 I drive also has a map sensor, no maf sensor.