Gog said:I've seen a few people say that you could forgo the -4 for firing into melee but that it gave you a chance of hitting the wrong target.
Hypersmurf said:I can't remember if it was a rule (FAQ, Sage reply?) or someone's house rule suggestion that the RTA for a Disrupt Undead spell ignores non-undead creatures in melee with the target as well.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.