Paolo Bertoli (University of Insubria) has published two interesting articles (in English) on the role of party autonomy in the Rome II regulation. Here are the references:
Choice of Law by the Parties in the Rome II Regulation, in Rivista di diritto internazionale, 2009, pp. 697-716.
Party Autonomy and Choice-Of-Law Methods in the “Rome II” Regulation on the Law Applicable to Non-Contractual Obligations, in Il Diritto dell’Unione europea, 2009, pp. 229-264.
An abstract has been kindly provided by the author: