One thing I've been wanting to try is cryo-treating of the timing parts. I know an engineer at Tsubaki that says that the heat treatment of OE chains consist of heating them up and dunking them in oil, a very uncontrolled process in favor of low production costs. He said that the chains would benefit from further treatments. Of course, this would only be cost effective if you plan on keeping the car a LONG time, probably the reason that timing chains are made so cheaply; manufacturers don't plan on owners keeping their cars for so long.