Tim,
As far as I can determine, only the newer EDGE and TALON line of Castle Creations ESC’s allow breaking in multirotor mode. The older ICE models do not.
As Pat mentioned, airplane mode with fixed endpoints will work but is not ideal. The throttle range/resolution between the fixed endpoints is rather limited compared to other (lower cost) ESC’s. Because of this you will not be able to get the start-up blip.