Still spell doesn't affect most of the parameters it's supposed to.

[dck k]

The description indicates it is supposed to let the player cast without doing gestures, but polymorphed forms that cannot do gestures still can't cast with still spell on. Also it is supposed to work with vocalize spell to allow casting while paralyzed, but this is not registering either. As of now it only seems to affect failure rates while grappled and such.