monks automatically get the ambidexterity feat, even with kamas, in fact, it is the preferred weapon of monks, if there is such a thing, and they can still use their flurry of blows mode while armed with kamas.
As for the assassin abilities, i run a monk assassin, and it doesn't seem like she gets the sneak attack bonuses, but she does, when applicable, but the only way I know is the paralysis thing. That is innate to an assassin. Are you getting that effect on targeted creatures at all?
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