Added an option for the function declaration return types, Newlines -> Statements and Declarations -> Force return type to one line. It won't be in the next drop, but the one after that.
For the justification, I'm not sure if I'll get to adding a third setting for that for v19. Playing with it, I noticed that disabling the justification settings, and enabling "Remove duplicate whitespace between words" doesn't clean it up either. So that's a bug I need to look at.