I run the PR2CT on the rear to get a bit more mileage out of it, while still having great traction up front from the PP2CT.. so yes, on purpose. So what I gain is a buying a few less tires a year, with giving up very little performance. The PR2's are surprisingly good for an "ST" tire. Most of my riding is long distance riding with some occasional twisties thrown in, so the combo is a good compromise. I've always run a similar setup on bikes, a bit stickier front, with a bit longer lasting rear.
Right on...make it work for you!
Where do you go 'long distance'?