While you're at it, should make it arch between players within x distance of each other too.. put a blue aura around them and they can do double damage.. and after x amount of time, the player just spontaneously combusts. Also, if the lightning hits the right spot on Goku and Frieza's ships, they should explode and everyone on the map should die, since they then have no way off the dying planet!
Jokez.. I haz em'. Seriously though, while it would be a nifty idea.. the lava already hurts you, and people are going to be throwing each other into/through it so much, that another environmental hazard would be a bit much don't ya think?