With arrow keys you get three different speeds, say shift+arrow gives you speed "1", normal arrows gives you speed is about 2 times as fast, ctrl+ arrows is about 4 times as fast
Same with pageup and pagedown keys - Shift + pagekeys is 8 times as fast as speed "1", normal pagekeys 16 times, and ctrl+pagekeys is very fast, about 32times as fast as the speed of shift+arrowkeys
hope this info is needed

correct me if I´m wrong...
tom