A while back I suggested it would be cool for there to be Airships in IC2 and got the understandable feedback from the developers that it was just too buggy do to the entity conversion for airships, but I came up with an idea when thinking about a mod I want to develop.
What if you could create "sub-world" entities, essentially a secondary word zone within the world that can have block placed in it and when the sub-world moves it moves the items within. This eliminates the need for making a ship an entity and will allow items to still be accessible/usable while in motion.
I understand that this would be large focus and a lot of work, so I wouldn't expect anything soon (or even within the next year), but its a unique concept. I'll be looking into myself when I have the time and I'll post here code that i find.
But just an idea, thanks for listening.