It would be cool to see that in action if regiments have riders who relay messages
It would be awesome if you could write those messages and hand them to riders which could also be intercepted. Normal text chat would negate the use of that however as would team speak. Perhaps it could be used to show the enemy's position(s) instead along with messages.
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This is non-essential idea but I thought I'd list it (Have posted it in the suggestions sub board):
Perhaps a special rider/messenger class could have the ability to automatically pick up details about enemy positions/cannon positions etc when in the proximity of officers and take that information to other officers on the field who in turn would automatically share that information to their regiment's subordinates after a few seconds.
An icon would pop up on the rider's screen suggesting he has received new information (would fade within a few seconds). When he rides within the vicinity of another officer another icon appears suggesting he has passed on some information (would fade within a few seconds)..
Perhaps Officers of a certain rank could also have the ability to write messages (only 1 message at a time to avoid meaningless troll spam) which would then be automatically logged and attached to any 'ride/adjutant' nearby. When the rider delivers it to an officer it automatically gets stored in the officer's message log which would be a pop up window separate from chat etc where a history of logs could be stored and viewed at any time.