>  What is the 
> mechanism you need? 
> Fixes and enhancements are usually provided as changeset. Do 
> you have a "uninstallable changeset" mechiansm in mind?

Hey Alexandre!  That's exactly what I want; what I would like is a way
for reviewers using the BFAV to filein a changeset, test the changeset,
and then "rollback" the changeset so that the image is the same as it
was before.  I have a feeling that's not a realistic wish.. :)