yes, this is what I was hoping for, but didn't manage to get it. I could just change "G80" into "G81", but this doesn't change the time limit, of cause not, because both models are European models.
Additionally I could navigate the yellow field to the other 3 regions (EF, EB and EC, guess this ist für France, Britain and Spain?), but this doesn't change the time limit either.
So maybe there's a hidden button combination to get to G85 model or Hongkong or Australian models, but I have yet to find