There is a separate bug about making template imports use bzr deltas rather than full tree; doing that would solve this implicitly. However for now, this specific bug isn't part of the LP roadmap, though we would happily accept patches.
There is a separate bug about making template imports use bzr deltas rather than full tree; doing that would solve this implicitly. However for now, this specific bug isn't part of the LP roadmap, though we would happily accept patches.