The knock sensor on the iS engines is for future development and not currently active. The type 915iS has moved the sensor to the centre of the crankcase and the camshaft gear wheel has a new design to allow for an additional sensor that will read camshaft passage. this will be used to read the camshaft angle at some point to make it fully knock adaptive.
The current issue is also part of discussion about the requirement of the engine in EASA and FAA approvals. You are not allowed to have any controller that will give you an un-commanded drop in power. While it is understood that this is done all the time with airliners they have no verbiage to allow this on piston engines.
