If slower settings lead to only a very slight increase in fine detail, I'd still say it's worth the extra wait.
Of course, I have no idea what specifically you're referring to. But just sayin' that this is an important project since this is likely the closest we're going to get to a true HD remaster of the original for a long long time. So any little bit extra that can be squeezed out of it is worth it in my book :)