A 102 Yes.

A 103 Scrolls, no, as you're still casting a spell, which would cause the spell you're holding to dissipitate, even if it's the familiar holding the charge. Wands don't require spellcasting, so yes.

A 104 Yes, spitting acid isn't spellcasting.

A 105 Outside their acid spitting, no.

Q 106 Does the damage increases from Shikigami Style and Improvised Weapon Mastery stack?