Namaste toujour,
thank you for the post.
well..
according to the Suttas, Buddhas are omniscient though not in the same sense of the creator deities of those sorts of traditions. Buddhas know whatever they turn their mind to and isn't just a generalized sort of knowledge.
the term in Pali is
Kusalena and it is only used in a very few instances in the entire canon. it is a term which is applied to the sphere of knowledge of a Buddha.
from a technical point of view, this is called the development of the Dharma Eye. this is a subject which it taken up in some detail within the Prajnaparamita Sutras which are common to the Mahayana.
you can read a bit of it here:
http://www.buddhismtoday.com/english...nd%20Sutra.htm
metta,
~v