Artboard "code identifier/label" in addition to title
When working on a large project, sooner or later, the wireframes will be handed to developers. A clean and transparent stucture is essential. I would suggest that, beside the existing art board title, there would be a art board 'code label'. Example: LOG-020 or MENU-001 etc. In web view, code label and title could be shown together like '[LOG-020] Visitors login screen'.
The art board list on the left hand side in XD could be sorted on code to get a well organized list.
An export function to xml could also be handy to get the complete project stucture to OmniOutliner or other outline software...