I've read the Python-committers thread "Pulling from contributors repositories", which is about version control system. It seems there are two main issues, linear (cleaner) history on pushing, and NEWS merging. I'm newby of bazaar, but it seems to have a solution for first issue. $ bzr checkout /repo/trunk $ bzr merge /repo/feature-a $ bzr revert --forget-merges $ bzr push See http://doc.bazaar.canonical.com/latest/en/user-guide/adv_merging.html#mergin...