I usually always ignore ranged weapons and in the current build consider the "No ranged weapons" a benefit due to not needing to research ranged weapon technology to get to the end of the warfare tree.
Both staves and Bows seems slightly worse than melee weapons IMO, I might be wrong but... Melee weapons just works so well..
Chance to hit is based off accuracy (I think) but would be cool if dependant off spell mastery, I still miss the "Magician" squads from the old MoM, and all the other magical trainable units.
Sincerely
~ Kongdej