How about a total time for IL table for each category? It would be displayed under each column and counted from the fastest time per each level/track. Kinda like what SDA has for IL speedruns.

This is a very solid suggestion tbh, would allow for a competition within a competition as well. It's done wonders for Mario Kart and F-zero

We've wanted this, but I think we've been putting it off until timer modularity updates, which may unfortunately not be happening until some time after some game modularity updates being planned. There's numerous issues in the site timer code because there's time, in-game time, time without loads, etc, and they're all basically hard-coded. Adding things to IL tables on top of this probably requires undoing and redoing extra things later. I don't know to what extent that affects implementing this at a basic level, but it factors in.