Yes, it is possible. I don't know exactly where this is but I'm sure you could find it if you did some digging through the Scriptorium or on TWC's development boards. I suspect it'd be near the agent movement as well.

Note that increasing the movement significantly is going to lead to a vastly different game of teleporting armies and fleets that can cross broad expanses without being delayed by terrain. At that point the richest nation wins. Prepare for the Parthian invasion of Syracuse.

This is the trouble of a turn-based strategy game. In reality armies don't sit in one place while another marches through their lands, waiting their "turn" to react.