@Novian Is that really abuse? Large weapons often are just a damage dice step away from a regular weapon. For instance...
Short sword: 1d6 damage, 2lb.
Longsword: 1d8 damage, 4lb.
Large short sword: 1d8 damage, 4lb (Large 2x weight multiplier).
Short sword: 1d6 damage, 2lb.
Longsword: 1d8 damage, 4lb.
Large short sword: 1d8 damage, 4lb (Large 2x weight multiplier).