Why not more situations that incorporate tempered will into your lineup? As another poster mentioned, there are plenty of places where you can use it already, just not in make or break situations in most cases. In and of itself, it's actually a good spell. If anything, what would awesome if it came with a speed boost. But, not sure if that really fits into paladin lore. Or a removal of an additional status effect (maybe too OP?), but more in line with the Paladin's holy nature.