What do you think about something like this:
Clicking [Easy] could make a little tooltip appear above it. There would be 4 icons in it, one per each of: CS, AR, OD and HP (and 5-th one for 3-lifes?). You could just toggle it on/off, in other words - choose which attribute do you want to decrease.
And in case of AR, we could make it double-clickable, like DT/NC. First click would be for simple decrease (like -1/-2), depending on the map's AR, the second one would be for "the old good x0.5".
This way, a current [Easy] would just be the Easy with toggled everything ON and no matter how much things you toggle, it would always give you x0.5 points (sometimes we need only HP/AR, so decreasing multi penalty for less attributes would be too OP, I would keep multiplier as it is)(the 3 lifes can be discussable though).
No matter how much things you toggled ON, it would be just marked as an EZ, so there is no need to delete old scores or anything like that. We would have just added possibility for a little modification of Easy, but people could both play the old way and the new = choose what to decrease.
What to you think about this idea?