No, do not use NEW_ACCELERATION_COMPENSATION in MatrixPilot, for the following reasons:
1. The version that is in the repository right now does not work very well. I am presently working with the ArduCopter team to develop a better version. The ArduCopter team is testing it on quads. 2. Even when its finished, the NEW_ACCELERATION_COMPENSATION is of little value for fixed wing aircraft, it really is only of any use for quads and such. The only reason it was in MatrixPilot was for testing purposes. It is easier and safer to test it on fixed wing.
In fact, I am probably going to eventually remove NEW_ACCELERATION_COMPENSATION from MatrixPilot entirely. Once I have a version that works well, I will merge it with Mark Whitehorn's quadcopter code.