Pure ceramic valves are already available from American Ceramic Engine Co. for racing engine use. So production use could be closer than you think. Chevrolet ships their ZR model Corvette from the factory with synthetic oil. So it stands to reason that you should be using synthetic oil in your engine. No reason to wait around for manufacturers on this one.
Synthetics offer viscosity stability over a wide temperature range, and reduced friction.
Many race teams have shown power increases of 1-2 percent and up, just from the addition of the right synthetic oil. Synthetic oil may seem expensive at first glance, but it's probably the cheapest horsepower you'll ever see. It's likely that they will continue in this direction till we get something in the range of 0.53 to 0.58 which is standard in the high RPM world of F1. The YZ400F has a 92mm bore and a 60.1mm stroke for a stroke to bore ratio of .0.65. So the trend has already begun.