More opponents with shotguns: I have seen opponents with spears or swords (even outside the Black Sea) but shotguns wielding characters are very rare.
I think dogs in Junkyard and Al Fabet in Core City could be tweaked: they wander too much and tend to block some narrow passages. Worse, when that happen they stay still for a time (once nearly a minute), blocking the way.
In some place, like a certain fetid place, you cannot loot the corpse of some enemies: they are in water and you can’t reach them. Maybe extending the range of looting or modifying the enemies IA (for attacking closer to shore) can end this inconvenience.