I am hoping that there is a little more depth to skillcrafting than just Fire skillbook + Necromancy Skillbook = Corpse Explosion and that's it. Like Decaying Touch (or whatever the necro skill book was) + Ignition/Conflagration = Corpse Explosion and then Decaying Touch + Searing Daggers = Withering Flame (or whatever).
I know Runecrafting would kind of fill the niche of a Battlemage hybrid damage like enchanting a sword with a fire rune for some bonus fire damage but a skillcrafting combo like Crippling Blow + Ignition = Flame Blade would really sate those who go for a might and magic combination (like I do)