I think:
0.6 goals for hitting the woodwork
1.2 goals if the shot was outside the area.
0.05 goals for a corner
-0.1 goal for s yellow card
-0.7 goals for a red card
For every player eligible for the national team of the league you're in, you get to multiply the total score by 1.01.
All of the above would make for a fairer and far simpler game.