I agree with Jennifer, that I believe this is still in the works, but I desperately hope that if there is a setting so the DBA can approve these changes that this is something that can be turned on or off! 

I think BB is working on how those changes would be confirmed in the database...i.e. would someone (DBA) need to confirm the change before it becomes part of the record and can't be undone.  Maybe I'm remembering a dream or a conversation with someone else, but I know I would love to have some option of confirming updated information...I have worked with many folks who don't understand/remember that we don't delete or overwrite an old address with a new one, we make a copy of the old and then add/update to the new.  This type of thing will probably become even more of a problem with NXT as it will be super easy for a Fundraiser to "incorrectly" update a record.