[Balance] +Initiative items disproportionately powerful for caster heroes
Because the ability to get off spells first, and then to cast MORE spells in a given span of time is so powerful, this makes items that would otherwise be nice in the hands of a melee character, extremely powerful in the hands of a caster.
To remedy this, I'd recommend giving staves spell mastery/power bonuses that make them more appealing to use as a caster - I've been running around for the entirety of my current game with my two mage heroes using low level poison weapons that give a large init bonus over anything else I've found.