Staff Feat Mastery
By Haelis and Iwatt

Staff Mastery (Finesse or Power)
You are a master of the Quarterstaff, a simple weapon often used by farmers, peasants and travelers. In your hands, this weapon uncovers its true potential allowing you to surprise better armed opponents.

 Base Mastery: 1
 Requirements: you must be proficient with the quarterstaff or a similar weapon (Ashandarai, Naginata...) to be able to use these feats.
 Benefit: You have reached a level of proficiency with this weapon enabling you to use it to its full potential. When using the quarterstaff, it is considered to have the disarm and trip descriptors (+2 bonus to disarm checks and allows trip attacks).
 In addition, it gains the power or finesse descriptors depending on which mastery was used to qualify for this feat.

 Expanded Mastery: 2. In combat, you may take an additional attack when you use a full attack action while armed with your quarterstaff. You make the bonus attack at your highest base attack bonus, but all of your attacks (including the bonus attack) suffer a –2 penalty.

 Expanded Mastery: 3. As a free action, the quarterstaff user can decide to use his weapon as a reach weapon instead of a double one. The user can still choose to use the additional attacks granted by the expanded masteries 2 and 6 but not the extra attack(s) gained from using the weapons other end.

 Expanded Mastery: 4. If you hit with both ends of your quarterstaff, you gain a free trip attempt.

 Expanded Mastery: 5. If you successfully disarm an opponent with your quarterstaff, you receive an immediate extra attack with the other end of your staff.

 Expanded Mastery: 6. In combat, you may take two additional attacks when you use a full attack action while armed with your quarterstaff. You make the bonus attack at your highest base attack bonus, but all of your attacks (including the bonus attacks) suffer a –4 penalty.

Thanks to all the people from the Iron Heroes forums that helped create this and gave us ideas.