Let me know if I missed anything.
1. Proficiency: Battle Sorcerers are allowed proficiency with a single martial weapon of their choice. I forgot to take this into account with the axe, so someone else can have that if they like. (I will continue to use my other greatsword.)
2. Monkey Grip: here's the text from Sword and Fist, the only Monkey Grip I know of.
Monkey Grip
[General]
You use a wider variety of sizes of weapons.
Prerequisites: Base attack bonus +3, Weapon Focus with the appropriate weapon, Str 13+.
Benefit: You can use one melee weapon that is one size larger than you in one hand. For example, a halfling with the Monkey Grip feat can use a medium longsword in one hand. You suffer a -2 penalty on your attack roll when using this feat. This feat can be taken multiple times, each time with a different weapon.
Normal: Only weapons of your size or smaller can normally be wielded with one land. [Presumably this means hand, but a literal interpretation could be fun.]
(I didn't see anything about this only effecting the primary hand. If this was errata'd later, let me know.)
3. Other Feat Questions: My character sheet appears to be somewhat out of date down there. When I rejiggered my character earlier to have different feats and spells so that he could help the party more instead of being a one-orc army. Here is what my spells/feats should look like.
FeatsCombat Casting
Weapon Focus (Greatsword)
Monkey Grip
Oversized Two Weapon Fighting
Flaw (Shaky)
Where battlecaster was removed before so that he could not go full-on tankmage in the future with mithral battleplate.
Spells0: Create Water, Detect Magic, Launch Item, Prestidigitation, Message, Light
1: Fist of Stone, Lesser Orb of Electricity, Bladeweave, Geyser
2: Whirling Blade, Gust of Wind, Wraithstrike, Freezing Ray
3: Shark Bolt, Bands of Steel
Now, upon reflection, I seem to have fucked up on the prerequisites for Two-Weapon Fighting, and thus will find a different feat to use for this. In the meantime, I will use a single weapon.
Note that this would not have made a difference in the last fight, the only one where I even tried using more than one weapon at a time, because both hits were natural 20's, and the confirmation roll that wasn't a 20 would have been high enough to hit regardless due to the unaccounted-for charge bonus on the first attack.
On the other hand, does anyone want a +1 Greatsword? I'd swap for a shield.