Loxorz, try holding down the left mouse button to control your characters and see if it helps with the camera at all.
I'll give this a try when I next get time to play again - I was trying to move the camera independently of the PCs, although now that I think of it, it doesn't make sense that you should be able to see beyond what your PCs are able to see at any given time, so the camera control method that you suggest is probably the intended one.
I also recall that there was a tooltip about this when I started a new game, but I may have accidentally skipped it... :\
