I like the Outline product, it is a very nice alternative to OneNote, and the option for alternate storage locations to OneDrive is the primary reason I bought the product.
My feature reqests are:
1) The ability to duplicate Outline Notebooks, Sections, or Pages. Why: So I can create an annual or quarterly outline notebook and use it as a template for the next quarter or year.
2) The ability to easily Rename an Outline Notebook.
3) The ability to create and save custom digital Covers and Backgrounds to use.
4) The ability to scan in documents into a OCR PDF file using the built in Camera on iPhone, or iPads. Why: something similar to iOS Notes feature, or Microsoft Lens, or Evernote and other iOS Scanners.