I know this is kind of old but....
Goblich:
The math on everything is pretty rock solid, I've read them front to back.
He kind of alludes to how much an At-Will should cost under the sections for Flight if you read it a bit more.
Poison, now that you mention it was not entirely there, if the Spell-like section was expanded to include constant effects(i.e. auras and such) that might allowed for a wider array of customization though like previously mentioned you can probably use the 'At-Will' modifiers applied to flight for a spell-like that's similar. .
Multiple Arms can be covered in Natural Attacks Section under Off Hand Attacks.
SkinnyD:
Seems to me that the book was designed with the assumption that a player could assign ludicrous racial modifiers with out breaking the system.
That all said I haven't found any sections on Spell Resistance.
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