On the scent ability of Belkar: The Giant has stated in a forum post that in his world, halflings get an ability that works like this. It's related to their culinary requirements, somehow, but no detailed rules given.

On the level of the Linear Guild members: While I agree that the levels of Nale, Sabine, and Thog probably are equal to the Order's (for symmetry), it can not (yet) be proven. And that's what this thread does: lists proven characteristics (i.e backed by evidence). At the same time, Leeky, Yok-Yok, and Pompey does not have to be equal in level to the original LG at all, and specially for Pompey, the evidence suggests that he is not.

I agree that the number of feats should be updated to show correct values. And the missing Track feat was a nice catch!