I'm sure it's been said, but the ability to move a ship core seems almost necessary. I know there are amazing builders out there who can come up with an idea and execute it perfectly, but sometimes when I, and I assume other people start building, the idea shifts a little, one part looks better than where we started and we have to rebuild completely. I can imagine that the programming involved may be difficult, but it might be easier to allow a second ship core to be placed so the original can be moved. Maybe make it so that you can't exit build mode until there is only one core. I hope this gets some traction.