Dan, I have been working on this, and have now found why this didn't work for me. I had a cascaded set of projects, and one of these wasn't inheriting the workflow from the step before, but was redefining the same workflow. After the migration to V8 I only ticked the 'Keep moved items...' box in the topmost project, as I didn't realised it was redefined deeper in the tree.
Summary - my problem was my configuration, but it's nice to see a feature we desperately wanted has been included. I have this lodged as a feature request (3054), so this can be closed out now.
I really want to roll this out to our users, any idea when the 'Beta' splash screen when you start up will go away?