Reader derrickgott007 had a little PM conversation with one of the GT devs (skebe) over at the official PlayStation Forums.
It went something like this:
derrickgott007: People are already exploting the no damage to ruin the leaderboards….There are videos on Youtube on how to get 1.07min lap times by fence riding and going full speed into the turns to riccoceht off the fence….Please put in damage to stop these people.
skebe: Sorry for not being able to respond earlier… didn't know until today that this forum had a PM feature
Although we're not ready to implement damage until they can be shown in a truly authentic way (which is extremely hard work if you think about it), we are doing our best to avoid these kind of 'cheating' to take place.