Preliminary support for Mario Kart Arcade GP 2.  Thanks to crediar for the patch.
Fixed controls for MKGP2
A: Acceleration
B: Breaks
Analog Stick: Steering
Hooked up the analog controls and some of the other switches.  Thanks to MetalliC for the patch.

stickX - steering
stickY - gas / brake
A - Item button
B - Cancel button
Z - Coin
X - Test mode (not working)
Y - Service
Changed the gas and brake controls to right trigger and left trigger respectively.
Fixed "Virtua Striker 3 2002" stuck at boot regression and added working controls. Patch by MetalliC.
Nice backslash!