I have to disagree, even though I understand you.
Every game has an aiming sensitivity, whether its mouse or joystick or even keyboard. You just have to choose whats right for you.
Every setting has its advantage and its disadvantage, for example:
Imagine I made my sensitivity faster, I have less chance in precision thus more balls will go out. I have aimed faster yes, but there is still time needed for charging, that's why ball would go out or something.
You just have to find the right settings for yourself, just like you're trying to find the right stats for your player, right ? It's the same thing. So on the contrary, it would not create unbalancedness.
I do suggest you should implement this in the later updates