I just tried it on my Flying Touch II running the 1170 rom. I turned off "Haptic feedback" under Sound & display settings in the system settings. It read "Vibrate when pressing soft keys and on certain UI interactions." I then did a long press on the power button and it turned off without the usual vibration. But powering up, I still got vibration. So it appears to work on only certain UI interactions .
The vibration was driving me mad, too! So, I opened mine up and cut the wires on the vibrating mechanism. All quiet now! The next thing I am going to tackle is replacing the speakers.