Three comments:
1) What has happened that marks this need? remember the thread on "hard Cat A" where the prayer I have is that we first fix what is broken, then move to the fun and pleasure of fixing what is not.
2) What would we do with the data? Who knows what a helicopter can stand in upgust and side gust at low speed? What new tests will be cooked up, and will they bear any resemblence to the operating environment being questioned?
3) Will the regulators in their zest to make a new, shinier rule, make all helicopters the same by simply using the lowest common denominator when they set the rule? Will they ignore the very high pitch, roll and yaw control power of some machines, and restrict operations for all based on the assumed properties of the poorest helos?