Combine farro, salt and stock in large saucepan over medium. Bring to a simmer, cover and simmer stirring occasionally until the farro is tender (15-20 minutes). Remove from heat, drain and set aside.
While the farro is cooking, toss the squash, onion an thyme with 3 Tbsp EVOO and vinegar and 2 pinches of salt on a rimmed baking sheet. Arrange in a single layer and place in the oven for 20 minutes, turning every 5 minutes.
Remove and let cool slightly. Mince 1/2 of the onions.
in a large bowl, toss all ingredients except goat cheese.