Game Mechanics: line of sight issues

[Darwoth]

if i am standing with my feet on one side of a hill with the mob on the other it is frequently not possible to finish the cast, likewise if starting a cast and a mob goes over a hill, turns a corner or walks behind a pillar etc it will not finish either.

i know this is not classic as there was no line of sight requirements at all for casting back then, if line of sight requirements are going to be left in there needs to be some tweaking done to them as it is annoying enough when killing mobs and will be doubly so when folks start jumping over the crest of a hill to interrupt a spellcast.