I think it would be really cool to customize several options for PDF export, based on La/TeX standard options. My favorite options would be:

1. Page size (the standard page sizes are more than enough, IMO)
2. One side/two side options for those who might want a printed version of the project. On physical books it looks way better when chapters start only on verso pages (or was it recto? I always confuse those two. The page on the right side of the book)
3. Support for different input/font encodings. I need to use accented characters