To be clear, adjustments within spec will never void warranty. The spec for adjustment is broad from the factory in which you can significantly change the characteristics of the car, without going over factory tolerances. Alignment will never void a warranty as technically a pothole can change your alignment out of spec - will Lotus, Porsche or anyone else stop you from replacing a faulty door mirror...? Or a corroded alloy wheel? No, definitely not.
It's what I mentioned in my post above, when I had the specialist transform my 911 GTS, it was all within Porsche's factory specifications, but on a different end of the spectrum to how Porsche originally set it up. No warranty issues....