Preface: I'm a casual bencher who won't likely be effected either way by this decision. I don't see a need to change the rules for CPU-Z validation, but personally I will take the time to look at the result and see if cores are disabled and HT/SMT is on or off. I'll be honest and say that I use the argument that it's much more difficult to achieve a high result without disabled cores etc., but it does not take away from the achievement. In my opinion this is why having a variety of benchmarks is needed.
+1 for Leeghoofd's idea about the active cores column and if possible and HT/SMT - on/off column (this would make it easier when casually browsing results)