If anything, they need to make Krillin's scattershot how it was in the show. In fact, it wasnt even a shot, it was a beam. In FACT the beam was a split Kamehameha. He guided it up, then closed his hands together in an interlocking claw and the beam split into 5 beams and killed all the little green guys that Vegeta planted(I can't remember thier names). This was fromt the Sayian saga.
As far as the rest of the characters, Goku, Frieza, Buu, Cell and Vegeta are all fine. Gohan and Piccolo's Masenko needs buffing and Trunks needs a damn overhaul. And don't make the sword ultra powerful at the expense of his SSJ mode. I want to have more incentive than just pl boot to transform.
And the bakuhatsu-ha was used by Nappa. I don't know if Vegeta ever used it.