So it should be deliberate foul to stop a clear goal scoring opportunity = penalty and sending off
Just a foul = Penalty and no sending off.
We already have intention there for hand balls, so might as well have them for other fouls as well. Basically, this would mean that eg a keeper rushing out in a 1v1 who misses the ball but accidentally catches the player doesn't get sent off and the defending team doesn't get tripled punished (penalty, a man down and forced to make a sub).
Obviously two footed challenges, studs up etc are still punished the same way inside the area as outside with a red card.