Tricks for finding packages missing Requires(pre): coreutils ?

[Bruno Wolff III]

On Wed, Dec 10, 2008 at 15:37:54 -0500,
  Ignacio Vazquez-Abrams <ivazqueznet at gmail.com> wrote:
> On Wed, 2008-12-10 at 14:09 -0600, Bruno Wolff III wrote:
> > I am wondering people know any tricks for say getting coreutils installed
> > as late as possible in the set by livecd-creator so as to produce a maximal
> > amount of problems that can be detected. Or if rpmlint or some other tool can
> > detect this problem.
> 
> Get a list of programs install by coreutils, then grep through the
> results of 'rpm -q --qf "%{prein}\n" foo'. Doing the same for postin,
> preun, and postun might be handy.

I think that will be helpful for getting a more complete list. I like that
I don't need source rpms (at least for the first go around).

On a related Fedora style question is
Requires(pre) or PreReq the preferred way of specifying these dependencies?