It would be great to get an ammo slot or other free slot that gives specific Elemental Affinity. Much like Atma of the Lion for Lightning, or Ice/Light with Beyond.
Inside Aby you have a way to buff both Nuke damage and Enspell damage, which works out nicely for RDM, since we don't get higher Tier Nukes. Outside of Aby, we just don't have the same customization at all.
Affinity really shines on RDM nuking because we are starting to get less and less returns on MAB because we are tied to Tier IV nukes for our base damage. All the Affinity Bonuses are currently on staves, which is fine for nuking, but does nothing practical for Enspell Damage. Enspell Damage Items are generally not attractive because they take up slots that would be, generally, better spent on something else.
I would like to see a line of Affinity Ammo Slots and Grips so both sides can appreciate a significant boost to their offense. Rings wouldn't be a bad place to put them either.