There's no difference, unless your under 30mph (or 25mph? One is N2 the
other N3 not sure which). Under that speed you will go in a canned effect
of tyre spin, but that's all. Per example, press both and turn. You will
spin on a dime, very funny. You can have this with single-axis, you need to
press it fast twice.
But back to the point, it is not modeled. With seperate axis, the only
thing it does is that it creates an imaginary axis using the two ones. So
if you have 100% gas, and brake 100%, you will actually be 0% trottle / 0%
brake. To add to the example, if you have 75% Gas and press 30% brake, you
will actually be 45% gas. The only advantage you can get is that your
transfer between gas and brake (or vice-versa) can be faster.
Well, it's an example, because it's not actually full linear.
Many people misunderstand the term trailbraking. It is simply the action of
braking while cornering. You can do this in any type of controller, any
game.
--
-- Fran?ois Mnard <ymenard>
-- May the Downforce be with you...
"People think it must be fun to be a super genius, but they don't realise
how hard it is to put up with all the idiots in the world."