Add the possibility to create template documents and then allow to create a new document from template.
Template for example can have styles defined, or even text entered (for example for monthly expenses, etc...)
This doesn't seem to be a hugely popular idea, but for my purposes it would be really nice. I would love to be able to format Title/Info/Chapter/Scene/Text styles for novel writing. Now, if we can only get the EXPORT function to play nice... :)