I'm fine with turning off copies, but moves is a feature now and turning that off globally isn't something we can do. What we need is to get /r/2918/ in shape and get that in. If there's more work needed to support copies along with that, we should add that support as well.
disable rename tracking
Review Request #3709 — Created Dec. 31, 2012 and submitted
disable rename tracking Explicitly turn off git's rename tracking, which may be enabled in the user's git config. This is needed to prevent creation of diffs containing renames (which aren't supported by RB < 1.7) or copies (which aren't supported at all, presently).