Most of us are in the same or similar situations, we understand. So if you have your core rule book, the additional rules that we play with locally at DL are:
1. Hills and trees both block line of sight, and are "infinately tall". That means, even if you have an artillery piece on a hill, it can't see over other hills/trees.
2. In the past we played with the addition that ward saves and MR are able to be taken against the "killer spells" which normally don't allow any saves at all (i.e. purple sun, dweller's, or your skaven spell Dreaded 13th). The discussion you are talking about in that other thread is a discussion over changing the current rule so that only characters and not units may take a save against those spells, and that even then only MR will count and so a normal ward save is no protection against it (I personally disagree with that possible change, but that is the point of the poll ...).