To me currently using a keyboard i don't feel i actually aim outside or inside the box shots i feel i postion my body in the way i would to get the most out of it apart from that i don't feel i aim using keys while shooting do you? Does it work?
For me when i have tried it, It has not gone the way i wanted it too lol
i run up to keeper aiming for bottom left and he blasts it right at the keeper >_> i have yet to master the art of aiming i dont feel it works for me on PS2 i can shoot but on here i can't lol i can shoot with pressing a angle i have to let him shoot, To score i either score a decent outside shot or a cross-header or passing across keeper seems silly cause i get lots of 1 on 1's and want to be able to aim if the keeper does not run out i can't chip lol and i can't aim if he stays in the net >_>... So how do you aim holding leftright during the power gaudge after or before you press to shoot and holding it down 
For me when i have tried it, It has not gone the way i wanted it too lol