Exactly. Borg is working on an auto-hack utility, and you may want to suggest that concern to him.
I advise upgrading UBB6 first, then rehacking. If you're simply updating a hack, but not UBB6, then the author of the hack should supply you with update information from the previous version.
In a perfect world, ubb hackers would create data files used by Borg's software which could handle both updates and new installs.
-Jim