What our friend is proposing it really a roller "lifter" more then a roller rocker. See this Chevy V8 part:
http://www.shop.speedunlimited.com/Shop/Control/Product/fp/SFV/32401/vpid/4081409/vpcsid/0/rid/126429
Truth is there should be rollers at both ends as there would be on a hot rod V8. One on the cam and one on the valve. Probably not going to fit under stock valve covers but that's OK. Cavernous, billet valve covers are cool on Camaros. Perhaps the Porsche versions could have "The Heartbeat of der Fatherland" CNC machined onto the top.
Seriously though! The idea is a great one since it's getting harder to find oil that works in our engines and reducing friction and heat on the heads will never hurt either.