Just an idea for shooting/goalkeeping
POWER SHOTS/PRECISION SHOTS
The longer you hold down the shoot button the larger the aiming reticle gets (can land anywhere within that circle) . Basically the more power your shot has the less accurate it is. You will still have the option to take a quick shot (tap the button or hold for short amount of time) and it will be accurate. This basically means that if you are given time to charge a shot you are able to really challenge the goalkeepers reflexes without making the shot impossible to save with very high accuracy.
GOALKEEPER CHANGES
To create a good relationship between the new shooting mechanics and the goalkeeping. I would make the goalkeeping less "magnetised" and more physics based. If a fully charged shot is placed on target then the goal keeper should only be able to parry the shot away. Only weaker shots straight at the keeper or slightly to the side of the are able to be caught by "magnetism". All full stretch diving saves are parried/tipped away.