yes no no
-SR5 p.396 Energy Aura
... The critter adds its Magic to the Damage Value of any melee attack it makes. The damage may have a specific type (Elemental Damage, p. 170) and has an AP of –(critter’s Magic). ...
-SR5 p.171 Fire Armor Penetration
Fire-based spells: Fire AP = spell Force
To determine if something catches fire ....
-SR5 p.283 Combat Spells indirect
... with an AP equal to –(Force).
- There was a clarification about Stun Baton that i can not find. It basically said that, if you hit with a stun baton, you do either electricity damage or physical damage, and not both no matter how hard you hit someone.
SG p.115 [Element] Aura
... Said auras increase the Damage Value of any melee attacks by the caster’s hits ... Attacks are also treated as Cold, Electricity, Fire, or some other elemental damage (p. 105 and p. 170, SR5), and have the armor penetration appropriate to each attack.
Following the above, in general every attack is dealing damage only once. Toxin could be the exemption. And magical Attacks with AP, have a AP equal to its Force.
Elemental Strike (SG p.170) doesn't change the DV, it only adds a elemental Effect, and Elemental Body has a specific AP.