pretty cool. isn't WMMT and MK uses same reader ?
about F-Zero - I guess the problems exists because you use simple hardcoded replies instead of real emulation. (also the reason why WMMT and MK needs different that way made scripts - results is different on different contexts)
in meanwhile I've finished RE/emulation of Saxa HW210 RFID card reader, mainly for NAOMI Dragon Treasure 2/3 and WCCF games. but it also was used in number of Lindbergh games (Virtua Tennis 3, Ghost Squad, etc). let me know if you interested to know details.