from this command i get:

zypper se vgaswitcheroo does not return any result for some reason

i'll stick with SP2 for dual display functionality and use SP3 repos only for updates such as firefox etc.; i'll loose the better performance of the SP3, which i think was visible on my system after the update.
SUSE should come with a fix for this lack of dual display proper support in what is a wonderful OS; that being said, i'm already back to SP2 and using dual display with the ATI discrete graphics.

thank you for your help, Malcolm&Co