The three following feats,
Power Attack, Deadly Aim and combat expertise are no longer feats but combat 'options' that any character, NPC or monster may use at any time they choose with an apropriate weapon that you are proficient with. Characters count as having these feats for the purpose of qualifying for other feats and abilities.
The feat Weapon Finesse no longer exists and is not a prerequisite for any other feat, any character, NPC or monster may use their dexterity modifier in place of their strength modifier with any 'finessable' weapon that they are proficient with. Characters count as having this feat for the purpose of qualifying for other feats and abilities.
The feats Two-Weapon Fighting and Vital Strike now automatically upgrade into their Improved and Greater versions when the appropriate BAB is reached, they counts as themselves AND the Improved and Greater versions once the required BAB is reached for the purpose of qualifying for other feats and abilities.
ANY Improved Combat Maneuver feat now automatically scales into it's Greater version when the BAB prerequisites are reached and counts as both feats for other prerequisites. Performing combat maneuvers now only provoke AoO's from a failed combat maneuver attempt.
Expanded Crafting
Watching game of thrones and seeing Stark's sword get melted down and reforged into two new swords gives me more ideas for crafting.
Crafting base weapons/armour/etc. still works the same with the required Craft(item) skill requirements with the added ability to take metal materials from existing items. For example, you find a Cold Iron longsword but want a Cold Iron Greatsword. Put 2/3 the original weapons worth towards the crafting cost of the new weapon (20gp in the Cold Iron Longswords case of the 33.3gp required raw materials for a Cold Iron Greatsword). This makes reforging existing weapons better than simply buying the raw materials.
In a similar vein to an Arcanist ability, special abilities from other weapons, shields, armour or almost any magical item can be 'cannibalised' and added to another weapon in replacement of the spells usually expended, rendering the original weapon mundane. For example you take the magic from a +1 Frost Longsword and add it to your +2 Longsword, ending up with a mundane Longsword and a +3 Frost Longsword(paying the usual amount of gold such a bonus increase would incur minus half the cost of the cannibalised weapon).
