SO, OFFSIDE RULE N YELLOW CARDS FOR ALL THE PLAYERS CRAMPED IN FRONT OF THE OTHER TEAM'S GOALIE, PLEASE!
or programme the game in a way where the bunch of forwards are moved in front of the defenders, i.e. if defenders are positioned outside their penalty box, the forwards are automatically moved outside the penalty box too. regardless of the ugly tactics these players use.
AGREE WITH THIS IDEAS TOTALLY but not with everything you mentioned as I feel it has more to do with the unhealthy egoistical nature of these players, rather than all of them being entirely insecured. A few of them, maybe. Perhaps even me?