I think they should have some awesome effects if you decide to trans during a ps or a bs. Like maybe the beam/ball starts getting pushed by your turbo aura instead of your hands and, when you trans and your pl is greater then the other person, at the end the beam/ball should fly back at your opponent. Would kinda show power if you did that.
Also, if you have perfect trans for any state, you should be able to swoop and trans at the same time. Makes things look really cool. And Vegeta did that to cell and it looked really cool.