Normally when using booklet print option, you end up with book, that’s 1/2 paper size, so for standard printer you hold stack of a4 paper in half and end up with a5 book.
I think, good addition would be option to add option similar to “pages per sheet” in normal mode, where for example if you choose 2, you get stack of a4 paper, that you cut in half (lets say using guillotine), put one small stack on top of another, fold it in half and end up with a6 booklet.
That or more options for home printing books would be nice to see.