So having Grant land directly in Richmond with 5 divisions from a huge fleet in one turn, with my costal batteries in Norfolk only doing minimal damage on the host, has got me convinced that something should be done with fleets.
I think two things should be considered:
1: CP penalties similar to land stacks for huge fleets. IRL fleets beyond a certain size become impossible to manage....no one tried to run 50 vessels all at once up a river.
2: River and Sea Transports should be easy to detect (which seems to be the case), and should be made the target priority of land batteries. As it stands, if the fleet is big enough and has ironclads and such, the warships tend to take a beating while the troop laden transports often survive quite well.
Other options could be considered, like upping the power of land guns against ships, but if over-sized fleets are made very combat inefficient and shore fire is directed to concentrate on transports, that should make the old Richmond landing maneuver ( and Nashville grab for that matter) a much more dicey prospect.
It would make my day to see something like that in a 1.5 patch.
(and barring these changes, then slow fleets down..say 2 days per water region like when units are being transported by the river transport pool.)
Edit:
It would be nice if land batteries set to bombard ships would bombard ships in regions with friendly ships, in the same way a fleet can bombard the land in support of an army...