Can cvs2hg "backdate" fixup tags?

[Keith Refson]

I am in the process of converting a much-branched CVS repository to 
Mercurial using cvs2hg, and attempting to generate a Mercurial 
repository which looks fairly clean for future development.

One problem I am running into, is that cvs2hg is generating artificial 
changesets to close "fixup heads".  These changesets are given a 
Mercurial sequence number at the top, and a timestamp which is the date 
of conversion.  This means that my Mercurial repository contains recent 
commits on old, and abandoned ex-CVS branches - sometimes years old.
These show up as mysteriously revivified old branches in GUI tools such 
as "hg view" and tortoisehg.

Is there any way to convince cvs2hg to backdate these "close fixup head" 
changesets to just after the last real commit on that branch?  The idea 
would be to put these artificial closes "out of sight"

In a similar vein, is there any way of backdating "close branch" 
operations during the conversion to mark old CVS branches as inactive? 
  I want to leave these branches to be available for retrieval if 
necessary, but ignore them most of the time.  As with
the "close fixup heads" commits, just closing in Mercurial has the 
unwanted effect of generating new activity on dead branches.

Keith Refson
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