Does anyone know where this is? I tried "Options" -> "Input" which is where the optional key assignments are, but I am unable to find an action that looks right. Currently clicking the left mouse button over a spot on the map allows me to center the main map on that spot, and click and hold of the left mouse button allows me to drag the main map within the window. Other games, some too old to expect any chance of their being changed, use the middle mouse button for this function and I have gotten used it, so I would like to be able to assign that key in GC3 (and Crusade). Also, GC3 and Crusade uses holding the center mouse button to change camera angle, so I would like to assign a different key to this function as well.