Although this is as non-standard as it gets, as I recall, the accelerometer was nearly useless (at least on certain webOS devices) unless setFastAccelerometer() was set to true.

Were you thinking we could get rid of this altogether, or planning to move it somewhere else?

If we wanted decent perf but didn't want to expose the non-standard API, I suppose we could consider calling it "under the hood" the first time an app starts listening for accelerometer events?