Exchange 2010 Litigation Hold

I handle Legal Hold a different way. 

1.  I capture a copy of their current mailbox into the archives

2.  Disable deletion from the associated archives

3.  If an ongoing case with requirement to capture future emails I add them to a small Exchange Journal policy and use Journal archiving to capture future emails.

I dont' user Exchanges LegalHold processes at all.

Everything EV does will always be an edit
And it really depends on what you are using EV for, Mailbox Management or Compliance?
Compliance should really be accomplished via exchange journaling, but obviously edits won't be caught by Exchange Journaling or what not.

Unfortunately its the way that the product, and actually almost every other archiving product works, especially those dealing with stubs, it a "choose your poison" type of situation unfortunately