I had exactly the same problem.
After weeks of mucking about in the handling.cfg file I got around it.
Using a suitable ftp prog. open the handling.cfg file in the games data folder and find the 'infernus'.
Toward the end of the line of codes for the infernus you will see C04000.
Change it to C0400045. What this does is somehow give it rear wheel steer and no handbrake like a monster truck.
I'm not sure what else this does to the car but you can atleast go do the 360 in the driving school (keeping the X & A pressed).
As soon as I completed the 360 I saved the game across the road, changed the code back to C04000, restarted and completed the driving school (I made sure I got gold in the 360 so I didn't have to go back).
All the other schools I was able to do although the buttons aren't entirely correct until I got to the Bike school.
Unfortunately the same problem exists for the BF400, trying to do the 360 requires the handbrake to be on.
With the infernus I just copied the last bit of code from the monster truck because although I uderstand HEX, the codes seemed to make no real sense whatsoever and atleast I could complete the 360.
If anyone can figure out the code to turn the handbrake off for the BF400 then I'm sure it would work, I'm trying to do that now.
If, like me, you don't want to muck about with the main.scm, (I can't even open it) then this I believe is a much simpler and easier way around the glitch which allows me to keep playing with the mod installed.
Hope this helps.
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