I've only found the r to be a bit unpredictable with undertseer in the wet so leave cornering at speed well alone, there maybe some who feel that this is the ultimate test of a drivers skills but given that there have been multiple f1 champs who took it easy in these conditions i dont feel too ashamed to admit it.
While the sun shines, as long as you don't go into the corner way too fast to start with, the best way is to keep the power down through the corner so its right on the edge of its grip, if the front starts to go wide catch it by giving it even more rather than hit the brakes, it will scrabble about a bit at this point and i wouldn't advise it on roundabouts with cars either side of you but you'll find that after a bit of wiggling your going in the right direction rally style.
Its not something that first springs to mind when you think your losing it but it will keep you in good stead with the best of them and vectras from your arse all day long, i remember clarkson remarked once that he couldnt get the lotus elise to go round corners at speed without it horrendously understeering, afterwards the lotus test driver took him out at full chat and scared the living **** out of him through the corners on opposite lock!