If you're going to do it a often, get yourself another set of light rims (used, who cares if they have road rash?) and some sticky tires just for auto-x

Yes, you have to change them when you get there, but then they don't have any heat in them from the drive there, they stick a hell of a lot better and both sets of tires will last you longer. G-stock allows any tire do they not? Does that car have 5 lug or 4 lug? My buddys used to run a certain Mazda Millenia rim on their Type Rs because they could be found dirt cheap and they were surprisingly light and strong, with some Hoosiers or Kumhos.
Definitely forget shifting, it does add time even if you're very quick on the shift. That motor has a wide enough RPM range that it should be OK, though you will be running higher in the RPM band (which is where more of the power is in this car anyway

) Yes, a bit of oversteer is what you want, because push is a bad thing on a tight, short course, which nearly every auto-x course is.
It doesn't take a lot of practice to learn to shuffle steer. Force yourself to do it, and it will become like second nature.
*edit - check and/or change your oil before you go...
I wrecked my R before I got to Auto-X it...

It has also been a long time since I went to an Auto-x too
