IIRC observation baloons were starting to be used for reconnaisance by the time of the Napoleonic Wars. If these are modelled on the battlefield then you might get your wish.

Otherwise, I was thinking that if naval bombardment is included in the form of an "off-map" fleet being able to be ordered to bombard a specific target during the battle, this might be a way to do things like long-range artillery, air support etc.

As for Davy Jones; never mind Pirates of the Caribbean, I want a Guybrush Threepwood mod.