I think it would be a great addition.
But as said. It's theoretically possible, but it would require a lot of work. I am not sure how it works with DirextX 8 (thats what LFS uses). In DX9 it's relatively easy to get working (so you can put images on the other screen). But it would probably require syncing and other stuff, that might not be obvious before you start to do it, to make it work properly.