I am surprised that that I have not seen any comments on the scroll key on the phone side. When I try to press the CENTER, to select a function, I usually open the camera instead.
I have found a Communicator Forum in Switzerland that has the perfect solution. Following their advice I have now placed a small washer (0.7 mm thick) onto the keypad, inside the front cover, and now my 9500 is close to perfection!
Follow this link: http://www.aikon.ch/serie80/index.htm. Then select "FAQ & Tipps". Scroll down to "9500 F�nf-Wege-Taste am Telefonteil". The text is in German but there are plenty of photos that will show you how to fix this.
Good luck!