I realize this is non-trivial to implement into the GUI and possibly of limited interest to others, but I think that being able to view diagnostics of the system over time like "Average temperature" or "Average Pressure" would allow users to get a better handle on what exactly the users have created.
This does sound interesting. I might add it to my mod sometime. My mod (also my lua script) already records and can display how long you've played total and for the current session, average and highest fps, number of times played, and total afk time. It wouldn't be that hard to add a few more statistics.
I love the idea on a statistics menu. You could put the FPS, particle count, average pressure, average temp, and a few other things in there. I approve.