Pair of newbie questions

[Huntsman]

I searched but didn't find any definitive answers:

1) Can lightning spells (Orb Lightning, Lightning Bolt) be negated by a target's MR?

2) If I give a Firbolg a longbow his Enchanted Spear still shows up on his weapons list. Does this mean he's able to use both weapons? For example, if I set him to "Fire" on enemies will he switch to his spear if he's engaged in melee?

TIA