Hm, I kind of grew fond of the option to change your element (basically every D3 skill allows that nowadays).
My mage is lvl 18 and waits for the runemaster release So I don’t have much experience, but maybe that’d be a route worth thinking about.
(Like make a side-route behind the channeled blast that converts the lightning ray to a cold ray, changing 100% of lightning damage to cold and chance to chill/freeze… add behind that maybe “10% Chance per Point that a frost nova emanates from the hit enemy, freezing enemies around him” or stuff like that.)
EDIT: Or make it a rainbow ray, like the Nova. Changes to a random element every second, with a chance to ignite with fire, chill with ice, shock with lightning…
Or I don’t know how viable a melee caster mage is (Spellblades attack with their weapon I think?), but the lightning could also change in a relatively short ranged ~120 degree channel with more damage and chance to stun or something