I gave up on seperating a single changeset for one file, which has definitely no dependency on all the other changesets.
Am I the only one who wants to isolate specific fixes in a development tree and push them into a bugfix or stable tree ?
Don't even try to think about the possible workarounds!
Google revealed, that this functionality is work in progress since 2002:
...to BitKeeper in the pipeline that'll allow a single changeset to be pushed..
BK does a lot of things really good, but this is a fundamental flaw.