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I know some people will disagree with this suggestion, but i'll explain my personal reasonment about it, it's fairly simple:
Sorcery is a multi-task stat, while melee and ranged has only 1 purpose, which is damage.
A character investing into sorcery has the advantage over the 2 other types, they can dish out damage and heal, while investing into a single stat instead of spreading out, i've also noticed in the talents trees that there is no dodge nodes for ranged or spells, which leaves melee at a disadvantage in PvP.
So my suggestion is to make healing-based items, and offensive spell based items, instead of just merging them together.