"I had a brief look at the kernel tracker, and it does look more useful than I remembered. The standard tests there (dbench and so on), and although it looks like a lot of the tests are a bit pointless (basic single-thread cpu-heavy workload), they can probably be disabled."
Single-threaded benchmarks are not pointless. I had regressions in single-thread workloads caused by 'too clever' locking which had higher overhead than good old lock_kernel.
Anyway, it's certainly possible to disable uninteresting benchmarks in Phoromatic.