Personally, I think renzoku needs to be totally reworked. If they want to keep it as a ki-blast, that's fine, but a charge up requiring that much energy at that slow a speed to fire a mere 6 ki blasts is just silly. To change renzoku into somthing useful, I propose the following changes.
:: Remove the charge time.
:: Have it fire at 2x the speed of the current right click with any other charecter using a kiblast attack.
:: Increase ki cost to 4x the normal ki cost of a single blast.
The following changes make it so the move becomes useful in a pinch, and actually has applications. It won't over power it because the ki cost is too high to keep that up for any sort've legnthend period of time.
Furthermore, on the beam issue- GG is a great attack. I don't care what anyone says, it's quite potent due to it's relitivly low ki cost and high damage comparitivly. However, giving vegeta a "blue" FF wouldn't be a bad idea before ssj. Keeping it's ki cost the same, I'm not even sure one would be able to half charge the attack if flying or in turbo. It would mainly be a desperation attack- to waste all of your ki on a half charged beam that moves slowly and will not have such a large explosion due to vegeta's relitivly low starting PL, it's not even looking that great but adds diversity.
As of right now, the only reason anyone chooses vegeta is because they think he's a cool charecter, or for fun reasons basically. In terms of balance, he's pretty underpowered with a gimped ki blast, limited beam selection, and low starting PL. On that note, I think that goku and vegeta ought to switch starting PL. It makes sense both chronologically and in terms of balance. Vegeta will start with a small 50,000 PL advantage, which is pretty nice but nothing amazing. His trans, however, still comes 200,000k slower than goku's, meaning he'll have a slightly stronger early game and a much weaker late game. Currently, goku only needs to earn 1 million PL compared to the 1.3 vegeta needs. With this change, goku will have to wait a slightly longer time, nothing serious, having to earn 1.05 million before his trans. Vegeta will still have a slower trans, having to earn 1.25 million now, but it's not AS bad due to a slightly enhanced starting game.
Just a few things I've been meaning to point out.