To answer your first question: What sort of secondary skills are we talking about? They mostly compliment the primary skills which takes higher importance when deciding tactics.
Secondly, Full Court Press or FCP can be a double-edged sword. The good thing is you can create a lot of turnovers from steals but on the other end your defense will leak points and offensive rebounds fast. So only deploy it at your own risk particularly when you are against an opponent with weaker handling and inferior rebounding.