I am interested in this, but whether or not I will get it depends on two things:

How maneuverable are the "Wyverns"? Can they fly backwards, fly in tighter circles than vanilla>
Also, is the fire straight-line or more "A bunch of spread out missiles" as is typical of the vanilla fire wyvern? Does it get stronger by level, or can its strength be otherwise customized? I hate how weak and ineffectual the fire attack is in vanilla... if I wanted to bite stuff to death on a flyer, I have Argents for that.

P.S. ini?