> You're confused about what is meant by "theme" in the context of  
> Custom.
> It's new in Emacs-CVS and is still very poorly supported/documented,  
> but the
> basic idea is that you can take your .emacs and say "here is my
> DavidReitterTheme".

Oh, then I see - well that's exactly what I would want. That would  
allow us to integrate something like an OS X theme without mandating  
it.  If such a theme would be supplied with a main version and switched  
on by default on OS X, I suppose one would want it to be well-tested.  
Even though the collection has been around for a while, I feel that we  
need some more feedback from users. We're getting this now - with some  
problems being genuinely due to our distribution.

>> for example to handle scrollbars correctly.
>
> Please report any complaint you have against the scrollbar with
> M-x report-emacs-bug.

I have reported this in various places, for example on  
emacs-pretest-bugs here:

http://lists.gnu.org/archive/html/emacs-pretest-bug/2004-03/ 
msg00110.html

and Steven Tamm and Yamamoto Mitsuharu have been made aware of it a  
while ago.
I have no plans to report the same problem again :-)

-- Dave