Personally i think that attack is the bomb.
How it would work is a great ammout of energy would be sucked up, a little less than the final flash, the more it is charged the faster the bolt moves, BUT, this attack would take quite some time to charge to its maximum power, maybe, say the same as the final flash, maybe a little longer, if the bolt hits, you die, just like the destructo disk. How do we even this out to make it fair you all ask??? Well as I recall from the series, there was a fair chage time PLUS lightning so whats say this;-
-when charging Vegeta CANNOT move
-it is an ssj only move (if they ever give out more transformations then only for majin vegeta)
-the charge time is quite long
-when charging it is clear to other players around that the attack is being charged (large aura and lightning [maybe])
-after firing it, you cannot control it
-there is a little explosion (maybe the ki blast size) that does as much damage as a weak kamehameha splash
want a secondary fire for it too??? well how about the ring attack which has been thrown out recently. I wont give any suggestions because ive already seen some great ones thrown out