why cant you change cpu routes for challenges

Why cant you change CPU routes for challenges? Because what if you wanted to create a challenge that blocks off every other path on the track, but there's a CPU route for every path? If that's the case in VS mode, then the CPUs that take the other paths will just go back and forth on that same spot and will never follow the track, no matter how long you wait. So to fix this, add an option that lets you change the routes that CPUs take. At least give us an option to enable or disable specific routes. For example, if there's 3 routes, it would show routes 1, 2, and 3 as options that you can enable or disable. So please add this feature because it's a problem on a challenge that I made.

PLRASE RESPOND WHAT IS TAKING YOU SO LONG

You can't do it because this feature isn't programmed.
Good suggestion though