1000 RPM would be a little low, but I think that perhaps 2000 RPM and 15 mph would be a little more reasonable. Apart from that, I think this is a legitimate idea, as long as customers are well educated on how to deactivate it!
Well instead of developing that "valet mode", I think Lexus can improve their current Adaptable Cruise Control so they can work as a valet mode at low speeds.
1990-1992 Corvette ZR-1 had a separate valet key that restricted the RPM, disabled the second fuel injector circuit. The current Lincoln offers "MyKey" that goes further by limiting audio volume too reduce driver distraction by less experianced drivers. This could and should be a simple password function without needing any hardware changes, high benefit/low cost. Goof for it Lexus!
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