I've never heard about this before, but on the same topic - I have two friends with 2006 zx6 and 2006 zzr600 who had their frames cracked and replaced by dealer. Not to pick on Kawis but it is a fact.
Your right and they had a recall on the 10R as well it was doing the same thing from guys wheeling them to much. But I think you should be ok as long as your riding it like it was meant to. Its putting the bike into stresses the eng. wernt planning for that screws them up.
2002 ZX6R, Shark Skinz, custom paint, Ignition advance plate, Shift kit, Yoshimura TRS Full race with Duplex header, K&N, 14/40 gear and sprocket, Ivans jet kit and Dyno tune for 103hp at the wheel. 110hp with 110 octane!