In the first game, I made sure to set up Napoleon in the middle of the play map so that I could pass along messages and respond in a slightly more timely manner to events happening at the far edges of the map. However, with a full map spread plan, I knew from the start that often the groups would be out of command communication, so I did my best to consolidate a plan from various discussions and suggestions before the game and then gave each area a subcommander with each group having total freedom to act as they saw fit according to local conditions so long as they kept to the general shape of the plan (divided into one or two-step portions).
In the second game, I probably made a mistake in putting Charles off on the right wing; but that was the main thrust for a VERY slow moving Austrian team, trying to protect our LoC while exploiting a game rule -- about sending one corps safely off map around to one of our game-win targets -- and while taking the shortest possible route to the same victory target. Our setup also put our most elite corps (punchy but small) on the shortest route to taking our other victory target: BUT those were on diametrically opposite ends of the map. We knew from the start we were NEVER going to have good comms between those areas, so keeping the original plans in mind for each group (including the two corps teaming up in the middle) were vital, with independence to operate.
In either game, the only way to avoid a lot of comms problems would have been to create a Grand Army with the leader (me) in the center having interior lines, and advancing to our chosen target. But there didn't seem to be any way to protect our LoCs by this method (under the simplified supply rules we were using), and in the second game especially the Austrians are so slow that we wouldn't be able to bring the enemy to fight if they declined.
Our strategy in the second game was to capture the two victory points asap and hope to win the game sooner than later that way. I think it would have worked, too, except the French team managed to sneak a point-capper behind left-wing's line (somewhat by accident!) who then sat on the point unnoticed. Left wing (the Hindclawforce) were following the plan and so, as not to be bored, were actively defending ahead of Munich rather than sitting on the win point -- and also they were trying to take some heat off the devolving situation in the middle, of course, which was well within their operational plan, and worth doing if they could. But you can see, that this strategy doesn't need a lot of comms with the on-map boss. Unless the operation goes on too long and things start to fall apart after we should have won. (This is why I'm annoyed that Hindclaw never got sent any indication from Control that their supply route had been snipped back at Munich. Maybe the brigade was letting supplies get through, but then that should have been news traveling, too!)
On the right wing, where I was, I did seriously think about halfway up our path, about abandoning the plan and turning around to fall upon the enemies of the middle group (LowerJawForce) from the rear. Had we done so, we could have salvaged that situation, and then combined together to go get Regensburg (and with part of LowerJaw sent over to help protect Munich). But we would have had no way to keep the French from snipping our supply totally back at Passau if they were sending anyone along our path to do that. (We did have a second supply path, although we weren't ever told about it, but it came onto the map near Passau and wouldn't have made much difference if a major force had taken Passau, so long as they also secured the bridges near where the Isar flowed into the Danube.)
This was a case where our operational plan required us to be so out of comms to cover our bases, that The Plan took on more importance for less deviation (outside its broad parameters). If Upperjaw had done that, the FrontClaw force would have arrived on the map without us nearby, probably totally out of supply, and we would have been strongly delayed in securing both victory points, meaning Munich might be overrun by a stronger force. Too many vulnerable players depended on everyone, UpperJaw (thus myself) included, staying with the plan in order to secure the win before we got mulched by Napoleon consolidating his crews somewhere important. So I decided to keep going to Regensberg. (Also, to be fair, at that point things on the Isar didn't look, from reports reaching us, like they were going to fall apart completely: LowerJawForce was doing a bang-up job beating on the defending French, and securing a beachhead.)