| jonathan harvey 988 |
I think this is a great addition for 1st level up to about level 4. As an arcane caster you were either not doing anything or trying to hit something with your crossbow to reserve spells or because you were already out of spells.
About the only time that using the attack cantrips at will becomes powerful is if you couple them with sneak attack. If I was playing a rogue I would have to think about taking 1 level in sorcerer or wizard to pick up a couple of the attack cantrips to have at will ranged touch attacks to deliver sneak attack with.