How about making the low% being the usage of the objects (crystals, bubbles, clouds, etc) Take track of all of them may be difficult, but they can be sub categories of lowCrystal% for example.

Even before learn anything about speedrun the game was a thing, I play most of the game using the least amount of objects for example in the chapter 1 you can completed only using 1. This in the last chapters becomes a nightmare if you try to avoid all of them, but only avoiding crystals or springs for example is viable (and also very fun to try)

What do you think about a lowCrystal% or lowSpring%?

1. Not sure why you made a new forum post when you had just posted in another one, no need to have a ton of separate forums.
2. Keeping track of things like this is not efficient in speedrun.com
3. These categories would not be made unless a noticeable amount of people actually showed interest or did runs of these categories.
4. These runs would be annoying to verify as you would have to make sure they did not touch an 'optional' object.