Some question about image installation feature

Hello everyone,

before I start doing some testing myself I wanted to ask the list if 
anyone has experience with image-based AutoYast installations?

I see that openSUSE12.3 DVD brings some prebuilt images for Base,X11,KDE 
and so. See here:
http://download.opensuse.org/repositories/openSUSE:/Factory/images/repo/openSUSE-DVD-x86_64-Build0370-Media/images/

I have the following questions about image installation:
1) How would I include the prebuilt images from above?
2) What happens If I only need (let's say) about 90% of the packages 
installed in an image? Will the remaining 10% be uninstalled or stay?
3) What happens if updates are available for the packages contained in 
an image? Will YaST install updates additionally then?
4) If there is a YES to 3), does it make sense to use images in the long 
run? Usually, many components receive updates during a release lifetime, 
such that the benefit of image installation goes down over time, right?

There is a problem with the TexLive installation being extremely slow in 
OS12.3 (https://bugzilla.novell.com/show_bug.cgi?id=801874), so I 
thought about creating an image for texlive to speed this up!

Thanks for any help on the topic. I have not found good material in the 
AutoYast docs about this...

- J Brauchle