1) Honestly, I dont use hot routes but if I remember correctly, its the right analog.
2) Since you're playing with the 360 controller, im not sure but when you selet a play, it will say the button to flip the play in the top right corner. The button is the same when on the field but you have to bring up the audible menu first.
3) You can select other team's playbook as a whole but not for offense or defense itself.
4) I believe that there's a topic saying how to do this. I suggest reading that topic.
5) In game itself - NO. If you use FINN's editor, you can change positions and then transfer the file over using the transfer cable.
Hope this helps.