I don't think you can edit the bust size. That was the main thing they censored to keep you from making flat chested girls with small bodies.
You could edit it they just don't bounce anymore.
Nope, they actually do. I'm just waiting for PC, but seen those bounces on CBT streams etc. Breast size can effect how much bounce(from what heard), and JP PSO2 was also toned down before. If still referencing it to crazy bounce that could see in the character creator at one point.(changed due to desync issues or something)
Damn censoring rumors and censormongers coming out. Can PSO2 team just come out and say "No censoring here"(or what is) already, or are just gonna let people find out for themselves(and making rumors). ( ͠° ͟ʖ ͡°)