I picked up the Stormwrack book a little while ago, and I'm writing up a sea-based adventure. What I'm having a lot of trouble with is figuring out encounter levels at sea. Obviously, a group of opponents on a small boat are going to have a lower EL than the same group on an ironside equipped with all manner of ballista and a firespout. Does anyone have any experience coming up with these sort of encounters? How did you design them? I know the book says to get away from ship-to-ship combat as fast as possible and back to one-on-one stuff, but I haven't found much else about balancing these encounters.
Oh, and while I'm posting, has anyone ever run into a divine spellcasting class that casts spontaneously (ala Sorceror)?