In light of the new Haradwaith faction especially, and their Corsairs' thematic focus on naval warfare, I've been wondering if there's any chance of expanding upon naval warfare a bit, both in the main game and in WOTR. For the former, maybe just something as simple as giving better upgrades or even boosts to ships this faction brings to the battlefield, not necessarily new naval units. Maybe even have boosts if a specific unit were "commanding" a ship and naval units were nearby it. But for the latter, for WOTR mode, would there be a way to incorporate naval movements of troops on the overland map, or would that be something outside the realm of the game mechanics? Not just via sea, but even rivers would be really interesting, allowing you to bring to life, say, Aragorn and company's arrival up the Anduin to arrive at the Pelennor. You hear about ships going up river in the appendices, too, to save the day a couple times.
Just some fun thoughts!