Found it with the hex editor I downloaded. (interesting stuff)
It's just -f
I should have lucked into that one when I was trying random stuff.
Thanks for pointing me in the right direction!
EDIT: For anyone who is thinking about buying this, a couple points:
1. There is a patch to fix the lack of music in the games that most reviewers complain about.
2. MAT Deluxe is just MAT 2&3 packaged together.
The games that are part of MAT 3 do not support analogue control.
(Hydro Thunder, Offroad Thunder, SF Rush the Rock, basically all the games I bought it for.....)
It will let you map steering wheel movements for left and right, but it has the same effect as pressing the left or right arrow.
There is no analogue control. Oddly enough, it supports rumble, but no analogue input.
The ones that are part of MAT 2 however do support analogue input.
How they could have Hard Drivin' with analogue controls on one disc,
and Race Drivin' on the other disc without them is beyond me.
But then again, we're talking about a company that shipped it without the music working in most of the games.