Deset Gled said:
There are many homebrew feats that do this (including one in the Netbook of Feats, I believe).
NboF is _not_ homebrew feats. These are d20 feats which have undergone a rigorous approval and review process.
From the NBoF...
POLE FIGHTING [General: Offense]
When fighting with a pole arm you can use the butt to strike opponents
Prerequisite: Str 13+, Weapon proficiency with a pole arm
Benefit: When using a pole arm in two hands, you can use the butt end to make an additional attack. The butt end counts as a normal club for most purposes, but it keeps the pole-weapon's original size. For pole-arms without reach, this allows you to use them as double weapons. That is, you can fight as if using two weapons, but if you do, you incur all the normal penalties associated with fighting with two weapons, as if you were using a one-handed weapon and a light weapon. For pole arms with reach, it means you can use the butt, without reach, and thus strike adjacent opponents. You are effectively using your butt end in two hands and get the improved damage bonus from strength that this allows.
Special: Pole arms include the halfspear, shortspear, trident, glaive, guisarme, halberd, longspear, ranseur and quarterstaff. The merits of this feat are intrinsic to the quarterstaff.
POLE FIGHTING Copyright 2001, Carl Cramér
Balance: 4.44 (Purp 4.60, Pow 4.60, Port 4.70, Comp 4.10, Rule 4.20)