Since the hardware is segregated, we want to create a new category with DLC.

And I don't think there is a clear prohibition in the rules about the use of DLC, so you should make improvements.

I thought each stage could be managed by an in-game timer.

This is the URL of the tested distribution 2:30-50:00 of the video I was thinking that the timer start should be the moment stage 1 is selected and the timer stop should be the moment the goal of stage 5 is displayed.

How about adding Ghost Road All Stages Clear Speed Run and Ghost Road 1 Stage Clear Speed Run for the casino to the subcategories? I tried to clear all the stages to see if I could do it, but it was 47:11. It is short, but I thought it might be interesting. Please consider it.