@robertybob I had been toying with the idea of adding an extra system menu with the games you last played on RetroPie as a whole, as I myself had a similar need.
I'm not sure how feasible that would be, but it's certainly something I would love to have. Would that help with this use case? Visitors would probably mostly be interested in games played in that session, I assume - even though the list would span more games, probably the last 50-100?
Thanks for adding me here!
Edit: alternatively, if it's a numbering thing we'd be looking for, I'd likely suggest a script and doing that via gamelist name editing.
Edit 2: yeah, there is also a sorting option per system that can do the trick in the interim!