Somebody correct me if I'm wrong, but true MAME code is supposed to emulate hardware exactly as it appeared IRL. Ergo, if none of the driving games supported in MAME used a sequential shifter for more than two forward gears, then it simply won't appear in MAME.
The only way for this function to happen in MAME would be in a custom build or hack, neither of which would be supported in this forum. Amirite?
|