I just finished playing both ways in the 1815 scenario and found that the French player loses a bunch of line infantry replacement elements to guarding depots that are totally out of the way. The biggest problem is that the active portion of the map is just way too large for the small scenario scope. I was rather miffed that I lost replacement elements to guarding depots and cities like Nice where there will be no game action.
The 1815 scenario active map area needs to be cut down to only cover the pertinent section of France that will be used in the campaign. About Dijon north and Caen to the west would be appropriate boundaries for this small scenario.
Another thing that's been bugging me about using line infantry replacement elements to guard depots and cities is what the heck good are militia replacements? So far every scenario I've played I end up with a plethora of unused militia replacements and a severe shortage of line infantry replacements. Why can't militia replacements be used for depot garrisons instead of line infantry?