Hrm.
Rough idea:
1st, to steal an idea from Monk Cook's Arcana Unearthed (IIRC, though this could be from Iron Heroes), class all weapons as either Power or Finesse (use STR or DEX for attack checks).
2nd, for any Power weapon, you can use Power Attack as an option (it's not a feat), with your STR bonus acting as the limit as to how many points you can trade. Improved Power Attack would be a feat that increases that limit (+2 might be a good idea). Weapon Finesse, as a feat, lets you use DEX for damage rolls in place of STR.
3rd: Attacks interate based on weapon size. Wielding only light weapons interative attacks scales on 4 points, 1-handed scales on 5 points (as core rules work), 2-handed weapons scale on 6 points.
So, with BaB 10, you'd get: Light: 10/6/2; 1-handed: 10/5; 2-Handed 10/4
4th: Wielding a 2-handed weapon gives you 1 additional AoO per round.
5th: When attacking, if your weapon is smaller than that of your foe, you provoke an AoO, which is resolved before your own attack.
6th: When you provoke an AoO from a foe with reach due to movement, you may elect to stop or continue to move. If you elect to continue to move, you are considered flat-footed and loose any shield bonus to your AC for the AoO.