Comment 1 for bug 507529

Oh, I forgot to mention: there was a discussion about a feature like this back in 2007:
http://thread.gmane.org/gmane.comp.version-control.bazaar-ng.general/21558
or https://lists.ubuntu.com/archives/bazaar/2007q1/thread.html#21660
Some discussion, but not much in the way of results, and certainly no patch.