Hmmm. On the subject of fur, mapping, and I can’t remember if I’ve asked these two questions before:
Some fur is multicolour right down at the hair level - one hair might start off blonde at the tip and darken up the shaft (or vice versa). Heck people’s hair can do that, and without hair dye either - sun can bleach the tips. Australian aboriginal hair is particularly prone to it, it’s very distinctive.
And of course some animal hairs are banded - alternating dark light dark light dark light. Banding combined with the correct length gives very distinct fur patterns.
Can we do that in V1?
The other question: overlapping hair zones - can we have two different kinds of hair occupying the same mesh? Soft fluffy light-coloured undercoat vs long stiff dark guard-hairs for example. Most mammals have dual layer fur like this, although there are variations.
You can set a global root and tip color. So, if your hair have red roots and green tips, the hair strand color will smoothly interpolate through those. There is no shader (but could do that sometime) that allows to alternate multiple colors on a single hair. Even if I don’t see this as a top priority.
You can indeed have overlapping hair zones. You can create more shave groups on the same follicle area, and have each of those groups use different properties, shape and colors.