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Too much acceleration, so it will be impossible to add unless there's a fix.

It isn't actually more correct, it was just chosen for convenience sake. It's more accurate than what you'd normally use, but not the best.
There actually isn't a perfect method because of distortion. 0% is matched at the crosshair, but less matched as you approach the edge of the monitor. If you match at 100%MM then it is not matched at the crosshair but more matched as you approach the edge of the monitor... But the best method is up to you and what you prefer. You could even scale the monitor match or use different methods for different situations.
Personally I use 0%MM because I like having the crosshair feel the same. And when you flick to a target you can still make adjustments - and those adjustments are so much easier to make when using 0%.