Moving the servo hole out increases movement of the servo and is mainly used for flying outside

It increases the movement of the rotor, which yes does give more manovarbility but also brings the rotors closer together ie blade clacking

No real benifits flying indoors

If you do this mod you need to open the second hole a little as its too small, and i would advise the extended inner shaft mod and shortened and lightened flybar mod to get the best from the heli