The hook code you are referring to does not exist in vB5, only vB4 & vB3.
No such major change will ever be made to them, since they are no longer in development.
(Even if they were, its unlikely this would ever have happened, since its a major redesign of the way hooks work).
As an aside, requesting changes to any vB core requires a Jira, its never going to happen (even for vB5) from a thread on this forum (or indeed on vbulletin.com forum).
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