I got the older PacMan one, so maybe it's a software update?  I'm just not sure.  I was hoping that one of the several people who have already hacked this would give me some hints, but maybe I've got this in the wrong forum...  I plan on using a J-Stick anyway, so I can change it from 4 to 8-way, so I'll answer my own questions in time.  Thanks for the reply Grasshopper.  

Just for future reference, Bosconian will play in 8-way mode.  It's just the restrictor in the joystick that causing the 4-way gameplay.