(2) BOARD AUTHORITY.—The Board may, by rule, determine that a foreign public accounting firm (or a class of such firms) that does not issue audit reports nonetheless plays such a substantial role in the preparation and furnishing of such reports for particular issuers, that it is necessary or appropriate, in light of the purposes of this Act and in the public interest or for the protection of investors, that such firm (or class of firms) should be treated as a public accounting firm (or firms) for purposes of registration under, and oversight by the Board in accordance with, this title.