1. Can you use multi targeting with running shot?

2. Does a character (with SS) who is holding an object have to use it when making a ranged attack or can they just make a normal ranged attack?

3. The mail box and soda machine objects add 1 to the attacker's damage rating. Is this only used for close combat attacks or does it also apply to ranged attacks too?

Any help would be much appreciated.

1. Yes
2. No, they can opt to shoot using their normal range attack.
3. Only to close combat damage, they are normal heavy/light objects for the range option.