that do what

I second this
the Shift particle display and the potion icons change are what I dislike for this mod, while also wanting to enable particles in first person, as if there would be a way to reduce its appearance 👍

The rest are what appealing to me

Little edit: since there is no config folder, to disable what I mentioned "dislike personally" you can remove DrawContextMixin from potionparticlepack.mixins.json, glad both the particles and the context were separated 🗿

Seconded as well. Here's what I would include:

• Particle color split can be toggled with a config flag, defaulting to true. If enabled, the "per level multiplier" can also be configured (with e.g. a value of 0.1 showing 1x as many particles for level 1, 1.1x as many for level 2, 1.2x as many for level 3 etc).
• Effect icons have a keybind and can also be unbound if so desired.
• First person particle visibility can be toggled with a config flag, defaulting to false.