my suggestion would make a 2player run with the same category but the rule is to finish both player with the same amount of point

Mirror mode I'm surprised there is no category for it

Mirror mode is identical to 150cc, just, well, mirrored. You are free to run mirror mode and submit it to 150cc categories. The rules used to say that, and although that phrase got lost when we rewrote them a couple years back, it's still perfectly fine.

You have to beat every staff ghost. You can have different categories for this, 150cc, 200cc, same combo as the staff ghost, any combo, with shrooms, shroomless, etc.

I suggest all run without items and coins