Iterman's page

Why stop there? Why not place your hands, fingers, knees and toes in there while you're at it? Knees and Toes?
If you are saying that there is no rule preventing you from doing this, then it is completely under your GMs discretion, and I highly doubt this would be allowed more than once (more than likely not even that). However, if your GM is fine with it, all the power to you.
Although, if your GM is somewhat mean he/she may end up accommodating you by having the tuba form there alongside your feet, inside the creatures mouth. This would more than likely relieve you of those pesky walking aids many call feet since it would crush them against the rough of the monster's mouth.

"Monk: A monk weapon can be used by a monk to perform a flurry of blows"

I'm fairly certain a lenient GM would allow you to use a monk weapon with your style feats but RAW doesn't allow such things.

The mental equivalent of constitution? Seems to favor charisma casters a bit too highly unless class designated SLAs are exempt from this ruling.

Edit: if it is in fact the mental equivalent of constitution why not also make it replace wisdom for will saves?

Your to-hit chance while TWFing is identical to your to-hit chance while using spell combat.

That was my thinking as well, I believe he's talking about the fact that TWF takes up 3 feats being the cause of its' "terrible" quality.