Our Oregon Region SCCA and Oregon Rally Group,
www.oregonrally.com , have RallyCrosses several times a year. I've participated in these since the "creation" of this hybrid sport in 1998.
It's basically an autocross event on a slick grass field, designed to simulate car control on loose surface rallies. It's not nearly as brutal on the car as you might suspect - I've only raced in one event that was "rough" (that venue is now gone). As a navigator in regular performance rallies, I've seen too much nasty, car-breaking terrain on local logging roads..
As to your question, the G20 is an excellent, stable handler. It's not as nimble as the A2 GTI I had used until last year, but on a fast, open course it's a joy to throw into lurid, 4-wheel drifts!
Those BTCC racers in Primeras from the last decade proved how good the basics are on both the P10 & P11, huh?. -Don