If I use "Show own cast bar" (which looks great btw!), then I don't see an option to disable the default Blizz cast bar? Can this be added? (if I'm missing not it)

I know this sounds a bit terse but as the default player castbar isn't nameplate related I don't want to get into messing with it in KNP. I've come to expect hiding default elements to be .. non-trivial. Due to past encounters.

AFAIK there are plenty of addons which can do this (or MoveAnything, at least).