If I'm correct, there should also be a couple more smaller checks done under the already existing settings, like Miscellaneous checks or Security checks. I'll need to verify that, though, I could be confabulating. Regardless, the more the merrier. The two new checks, Concurrency Stress Test and DDI Compliance Checking, are more catered towards various system freezes hangs like deadlocks and race conditions. This is definitely a good thing, since often times it's the freezes and hangs that are more difficult to analyze than the BSODs.