Here's my unreasonable suggestion.
The ability to easily make custom sails and rigging.
I don't know how doable this would be for you programming wizards but here's my idea.
What if, hear me out, there were some kind of node blocks to where we could link rigging to? Like the energy lines we can make now, but rope.
We'd need a special rigging tool (like the energy linker)
With that rigging and that special tool we could make surfaces from rope to...