Rather than just being able to select which difficulty we want, make it so it's a list of boxes or something, and we check off the ones we want to see and the ones we dont. A lot of the time I just want to filter out all the pit and kaizo hacks, but can't since I can just choose to see one difficulty option.
I came to forums to post essentially the same question.
But perhaps it would be easier to add two options to the difficulty slider: 'not kaizo' and 'all kaizo'