To answer your original question: there's not really much that can be reported in via a diagnosis tool. Cam deviations is the only thing that I can think of that really operates on anything other than a ’it's ok/not ok’ basis. Maybe responsiveness of Oxy sensor but everything else is fault code based.
Still worth doing IMO, but don't expect to much.
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2001 Boxster S, TipTronic in Seal Grey aka "The Imp"
2001 TE50, ESS in (now) Grigio Titanio Matallizzato aka "The Golden child"
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