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That would be a relatively easy way to raise the compression. As you said, you have to watch the valve to piston clearance, and assuming the R6602 is similar to conventional gas engines, you may have to make a set of pushrods or adjust the valvetrain in some way. You may also have to do a...

I think the main problem with not idling down a turbo is the lack of oil pressure. Since turbos spin at crazy RPMs and have some really slick bearings they can spin a long time after the engine has been shut down and the oil pressure is gone. If you shut one off while the turbo is still hot...

It could be done, but it wouldn't be worth it. The 602 is the gas engine, if I am thinking correctly, and unless you can have custom low compression pistons and a new cam ground then you won't be able to run any large amount of boost. Then there's the whole deal of custom exhaust manifolds to...