usually, I just adapt it. It'd be unreasonable to expect it to cover every instance.

As far as charging/prepping, both are the same to me. Interchangeable words and all that. I can prep or charge it, Kusanagi's effect is the same. 

I look towards most magic/energy related fantasies, where there does seem to be some kind of charging and the like to use them. In Malazan for instance, if a mage wanted to use the magic, they had to prepare it in some fashion. For example, forcing people to choke on water. They had to use sticks and stuff, it was some weird shit. 

Now, as far as low level little blasts that are more annoyance than 'if it hits you, you die, lol', I don't really care if they are charged/prepped or not. But even in the DBZ example, for their big attacks, they did charge or prep them in some fashion to get all that good 'ol power. Ki Blasts? Maybe not? Death Balls and Kamehameha's? Definitely.

At higher levels, that may seem trivial and stuff. But we mostly don't fight at higher levels, so that's a moot point.