To speed up combat, replace the ability to make multiple attacks if your attack bonus is +6 or more with the following:
If the melee attack bonus is +6 and the attacker drops or slays a foe, he is granted one additional attack against another opponent in melee weapon striking distance that round. As long as the combatant is dropping foes, he can continue attacking others until one does not fall to the might of his weapon.

As suggested by EditorBFG, wording by WSmith (with minor editing by GreyWulf)