Mainly for strategus, but even in cRPG, I think naval battles would be a nice addition. Perhaps even some islands or something if some groups wanted naval based factions. I think a system similar to what PW mod has works well for battles at sea, perhaps with more hit points for the boats. It would be even better if over time fire arrows and bigger weapons (ballista? Catapult ship?) were added along with damage to specific parts of the ship. But overall, PWmod has a very good system of controls that would work well in cRPG battles. Obviously the drowning system would also want to be added in were this to happen.