dpkg-maintscript-helper is in dpkg now, so moving or removing conffiles just involves pasting the same call to it into 3 maintainer scripts.
Since to be safe it needs to know the version of the package in which the conffile move/removal took place, and since using it means a versioned predependency on dpkg, it's difficult to make debhelper fully automate using it. Still, the need to paste the same code into all the maintainer scripts (or most of them, and it should be ok if dpkg-maintscript-helper is called by all 4), is something that it seems debhelper could help with. Maybe have a way to insert debian/maintscript-common into all of them, for example. I'm not sure yet which interface makes the most sense. -- see shy jo
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