Larry West , Jun 30, 2011; 01:01 p.m.
Yes, there is. (fumbling through PDF manual on iPhone...)
Custom Function IV-1 "Custom Controls". The owner can set the selection of the point to use via the 'joystick' control on the back. It's the control in the lower leftcorner of that screen. Manual page 217-218. When set, and the camera is set to use anything but all 19 AF points, the joystick is active, and you can select a point, zone, or expanded point.
The 'Joystick' can even be used when selecting the point using the "normal" methods. Just use it instead of the two dials.