Kobolds as a species are extremely well known for working together in groups, and using their numbers to overwhelm stronger opponents. However there really isn't anything mechanically that give this feeling when kobolds are together.
I did notice however that Goblins have a pack tactic effect (+1 Soft wisdom and Discipline while there's other Goblin PC's within 20 Feet) and I am suggesting that kobolds get something similar, doesn't necessarily have to be a complete 1 to 1 copy of the goblin passive, but something to simulate the pack fighting tendencies kobolds have would be nice.
not to mention it'd be a nice boon towards the fairly thriving Kobold Community, even though we're kind of mechanically one of the weakest PC races.