Shandon and others,
As JonB says above, most of our club members (and we're a track oriented club) just slap on the SSR's and Kumhos, drive to the track, drive the track for two or three days and drive home without issue.
The SSR / Kumho package is so superior to the OE set up, i.e. they are much lighter and the traction of the Kumho Ecsta V-700s is vastly superior, that literally all of our guys run faster and safer on them.
As for the rake issue, lowering the rear of the car by installing shorter tires lowers the "roll center" and makes for better rear traction, which helps prevent spins. It also increases static camber in a very good way for the track. Toe is minimally impacted.
Mark is correct, as a guy who likes to go faster than most, I trailer my car and have a track specific set up including tires (R-6), wheels (SSR's), track alignment, track brake pads, brake cooling ducts, track shocks, roll bar, six points, race seats, engine mods, lap timer, etc., etc.
Not everyone wants to do this initially, so the SSR / Kumho package works very well for them.
Dan