I've heard you have to hold the button and spin the wheel while the button is held, to change any button-driven settings. Is that true? I've heard the button logic got much better in the 1D[s] Mark III generation.
IIRC the 1D2 lets you pick any AF point...if so, that could be a nice "upgrade" from the 1D3 (only 19 of 45 were selectable).