Like the PP, I have 0 experience with HoB, so a grain of salt is needed.
If they follow other non-Disney locations trends, chances are you can add that salad, but you'd have to pay OOP for the salad itself (thinking of VN here with the additional pizza toppings). So, my random guessing is that you can use the TS for the entree, but you'd have to pay the $3 for the salad. I could be totally wrong though and they may even not allow you to add the salad at all (the chances of it being covered are pretty low).
May be worthwhile to give them a call to see what they say (the restaurant itself, not Disney Dining). Otherwise, just ask while you're there. While that won't help in the planning phase, at least it'll be a definitive answer.