Yes, the simulator currently only implements full support for this feature, and does not allow turning it off. Yes, simulating that scenario may be valuable, so we'll look into how to incorporate that into our simulation tools.
Are you familiar with AutoANT? In the meantime, while not an ideal setup, in order to simulate a device that does not respond to the get request you can create an AutoANT script to transmit predefined power data. AutoANT will not respond to requests from your app unless it has been explicitly instructed to do so.