I searched for 'pngcrush centos' and 'pngcrush windows'
and concentrated on the win stuff after I found nothing
on the contribs.org site.
add the magic word "rpm" next time

Does setting my SME7 up for
the dag repository take me 'off normal' for SME7/8
update purposes?
no.. just remember to never do this
yum --enablerepo=dag update
as it will likely break your server
when you will upgrade to SME8, you'll need to install the rh5 version of the rpm