I found driving the WRX really easy. I haven't even come close to killing the engine (something I expected to do.) I just assumed it was a hydraulic vs. mechanical issue and the WRX was hydraulic and everything I had driven in the past was mechanical. So maybe it's just my point of reference but I didn't think learning to use the clutch part would be hard. I was just worried about him being pre-occupied with looking at the road, the boost gauge, seeing if girls are watching him, etc. that he might not pay enough attention to the rpm's.
I like the suggestion of "if you red-line" you will "blow it up" a lot. I think that will get his attention. He's a really smart kid so I'm thinking he will know more about this car in a week than I"m finding out but I can keep him scared for a little while!