I believe the easiest method to make one would be to use the ghost system to make one, you could change the positions the TAS goes to.

Or you could also use some sort of AI to do it which is completely possible on scratch (proof! AI)

if you do you might want to consider looking at their checkpoints and maps, i hide some shortuts in this game because im not mad if you break my game it makes it more active

Cant you just use turbowarp and make the framerate slower