Newbie question : how can i interact with opening registration screen

Hi, We are working for public schools in Geneva (Switzerland) and we made traditionally one monolithic image to be distributed with Deploy Studio. We started using instaDMG a few days before. Perhaps it's a newbie question, but there it is. I use the clearReg.pkg to bypass the opening registration screen, but after that i have USA time and no swiss french keyboard. So, it's probably not a good idea to use this pkg. So is it possible to fix some values for the opening registration screen, as keyboard and time zone ? Thanks in advance Christian