The rule I quoted was in the pocket rules and the PDF copy of the hardback rulebook, so maybe the rule didn't change as much as you think?
1: the smiley is offensive, because It's patronizing. If it were aimed at anyone else, it'd draw a warning, reading "SMILEYS DO NOT MAKE SNARK ACCEPTABLE."
2: nothing in the current rules explicitly permits both offensive and defensive fire in the same turn.
In fact, it's noted under "Firing Beam Weapons" that:
"A gunner may fire any or all of the weapons in his turret or bay but each turret or bay may only fire once per round." p.147. It doesn't specify offense versus defense.
The only wiggle room is that the point defense section doesn't say "fire"... but it uses the similar meaning "attack".
A gunner, however, can clearly point defense fire at multiple targets with multiple weapons.
3: unless you've looked at the playtest, you can't even begin to comment validly on how much it has changed. The entire task system was different, and the combat systems use almost no matching text, because they are very different in almost all respects.
There was no multi-defense penalty in the playtest. It was 1 AP (plus power per the weapon's power requirement) per defense fire. You earned 2 AP per turn, and had to have 6 AP to fire offensively (and could never have 7+ AP). So, it was inherently limited. An offense fire action resulted in 1d6 AP remaining... one of the two d6 thrown for the to hit; the other determined the damage. And weapons had to spend power points to fire.