Turn duration can also be set in Weeks or Months - Or am I missing something here?
Yes it can and that was done in EFZI2 Elite using the Original Civ3ConquestsEdit.exe. the Time-Scale and Terrain-Size are not a problem to alter as they can be changed with entries in the Civilopedia and the Biq to a reasonable extent. It is how the programming was done for Unit Movements such as loading into boats from land, using the boat to move the units to land then unloading and using the Units the same turn. That requires three turns and that affects Time-Scale and perhaps Terrain-Size.
How many times have you seen the AI try to have a Unit Unload to land from a Boat or Ship, only to have a Stagnated or Crashed Game?
So it is really more about how to handle the Navigable Rivers that is wanted concerning how Foot/Land Units can cross them and be used in one turn in a plausible manner.
If one loads a Unit into a boat from land, the Unit can cross a river in the boat but cannot unload until the next turn. IF one turn is suppose to be shorter, such as hours, the Unit should be able to load, unload and also be used the same turn it crosses.
If Foot/Land Units are allowed to cross the Navigable Rivers individually, there is the Graphics problem of appearing as "Walking or Standing on Water".
If Navigable Rivers are to be added and I agree they should for better Game Play, either program for "Bridge Building Units" that can build a temporary bridge for Foot/Land Units that can then cross the river and be used the same turn after crossing or program for Foot/Land Units to load from land into river boats that can take Foot/Land Units across the river then the Foot/Land Units can unload and also be used the same turn after crossing.
The problem is Programming concerning loading and unloading into and out of boats as well as also having the ability to do this in one turn as well as also using the Unit after unloading all in the same turn.
Example: A Marine loads into a boat, crosses a river, unloads and shoots an enemy all in one turn.
The simple way to allow this is to a set Foot/Land Units so they can cross the Navigable rivers individually but then there is the Graphics problem of "Walking or Standing on Water".
In the CivIII/Conquets Game, Graphically, Units appear to be standing on Forests or any building they are in but that is understood as the Units are in the Forests or Buildings... if seen on Water or crossing it, what is understood, are the Units in or on the Water? Either way, it is a Graphics problem that needs to be addressed and programming to allow for one turn timing with plausible graphics as stated above.