Re: use-commit-times = yes

The commit time is a property on the revision, svn:date. It is
possible for a user to edit this without leaving a trail. That's why
you cannot edit a revision property without a pre-revprop-change hook.
It is up to the administrator of the repository to create and maintain
this hook and to ensure that the standard user isn't modifying the
commit dates, the commit user, or the commit comments without
authorization.

-- 
David Weintraub
qazwart_at_gmail.com