[GoldenGlove]

1st Idea:
This would probably slow the game down, but maybe if it could create a lineup based on primary positions. Then go through each bench player for that lineup and match him up with the positions that he is suited for. If he is better than a player at one of his secondary positions, he is inserted. This of course is flawed as well, but it may be better than it is currently.

2nd Idea:
Create a formula for the offensive ratings. Then use this formula to place the highest players into their best fielding position. As soon as a player is found to have no fielding position open in the defensive alignment, go through his positions and find the higher rated player that can be moved to an open position. If nobody can move, then the next player is looked at until the lineup is filled.