I’m not sure if this is a currently a feature in the Mac Version and hence will eventually become a feature in the Windows version, but just in case…
With most of the documents that I compile being designed for a duplex printing (two-sided pages), it would be fantastic if we had the ability to set mirror margins, giving us the ability to make the margin along the binding edge wider, but narrower on the non-binding edge.
With that in mind, it would also be fantastic if we could get different Header and Footer settings for the two sides of the pages. eg. Setting up such that the left-hand page has the author field on the left-hand side of the header, but the right-hand page has the name of the book (or the chapter) on the right-hand side of the header. (I can easily achieve this with packages such as Latex, but I prefer the organisational and output features of Scrivener, which is why I use it.)
Having this ability in Scrivener would mean that I wouldn’t need to manipulate the file in Word (which I hate doing for large files).
You know you can combine the two? Scrivener has a “Plain-text” compile option which means the options are limitless when it comes to using the software to generate complex formats like a .tex file. There are a number of people using it for just that sort of thing, and others using it to assemble XML documents, and so forth. There is also the MultiMarkdown system which can generate simple (and thus easy to style) LaTeX using very basic Markdown style codes. But if you are fluent in LaTeX and don’t mind writing with it, then just think of the Binder as components of the final .tex document that will be created when you combine them all into one file. Creative use of the compile settings can even build out predictable sequences of code for you, such as wrapping the title of a folder in \chapter{ and } text, using the Prefix and Suffix features.
Whatever the case: Scrivener is extremely useful as a plain-text format generator in my experience—that is in fact almost exclusively how I use it, even for complex documents, such as our user manuals. Those are just LaTeX files once compiled out, at the end of the process.