A human has teeth but does not have a bite attack. Having an appendix does not make it a weapon. You need sharp claws, sharp teeth or strong wings to attack.
I see Gliding Wings gives wings, but it says those are too weak to fly, so I assume are too weak to attack.
And the two feats you need to actualy fly (and have strong wings) don't look like they are intended to give you an extra attack. I just don't see a kobold using his wings to attack like a dragon.
Griffons, Manticores and Hippogriff don't have wing attack, and all of them have bigger wings than a kobold.