Exist any ways to make increases to spell damage also apply to attack/elemental/aoe damage?

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Maxtrux wrote:

Wandslinger notable, on Witch's side of the tree, does the same job as Crown of Eyes, but only for Wand Attacks as it requires you to wield a Wand to get this bonus.

Kinectic bolt is also a Wand skill that will apply double the spell damage to its attack damage.

Other than that, there are no other sources of that mod. Crown of Eyes is the only item that allows you to recycle your +x% IncSpellDamage in your non-wand attacks (note that More Spell Damage is not translated in More Attack Damage this way. Only "Increased" and "Reduced" spell damage will turn into bonus/malus to attack damage)