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the other method
The third method I know of other than cryo or heat treat, is vibratory metal de-stressing. They vibrate your parts at a given frequency which is supposed to let the internal stresses relax. There was a reputable engine builder in the town I used to live in who swears by this method. Cranks and gears, he claimed, saw the most longevity benefit. Metallax I believe it was called.
The one other method I would like to see the results of is nitrocarburizing. Like a heat treat, but in a salt bath. It coats the surface in a nitrogen / carbon matrix which hardens the surface and makes it slick. Burlington is a local shop that does it in socal. I don't know anybody who has tried it though. It leaves the surface smooth and black, like a really good parkerizing, but smoother.
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