As you all know, FS has a 60KM battlefield limit that can prove very aggravating, as well as a problem where ships that are too big don't work properly in-game. And to top it off, every ship in the game goes way too slow, although I think there was some mod that fixed it somewhat.
Here's the big question- what happens if you reduce the scale of everything in the game by 10? Or 20? The numbers for distance and speed would be messed up, but you could maybe come up with an excuse for that. I'm not sure how well the FS engine handles very small numbers, but if it does work, just think- we can extend the battlefield by a whole lot, you can have large ships that actually work in the game engine, and since the battlefield is bigger, you could have higher-speed ships that don't break FS physics rules.
It's a rusty idea, I know, I haven't thought it all the way out, but I thought I'd throw it on the table.