Hello again, friend.
You may want to read part 1 of my mini-series before tackling on this public service annoucement post. Here it is:
Part 2:
Fact: When a ship has an auxiliary arc(s), it 'may' choose to use it, or it can simply use its front arc instead. It's always a choice, regarless of how good/bad these individual choices are.

Consequence 1: This particular situation can happen - your aux shot is range 1, while your in-arc shot is range 2. You can have the best of both worlds.
Take your aux arc shot at range 1 with a +1 ATK modification, while still triggering your Tactician stress effect, since the ship is in-arc at range 2. This has been known in the FAQ for a long while now.
Consequence 2: Consider the following situation:

Here, was have a range 1 aux shot shown in green, as well as a range 2 in-front-arc shot shown in red. Always take the range 1 shot, right? Sure, but sometimes you may want to take the range 2 shot:
if you're attacking a ghost with c3-p0, normally defending with 0 dice, normally not triggering c3-p0, but the green line would be obstructed, giving the defender the opportunity to use 1 green die, and thus try to guess the roll, thus possibly going up to an annoying 2 evades total. Take instead the range 2 shot, disabling any possibility of using c3-p0, despite the lack of a +1 ATK effect.
