Custom Tactics Trick to Avoid Pausing to Change Formation in FUT
Many people know this but there are still some who pause beginning of game to change formation. Basically, if you're okay with sacrificing one of the tactics (Ultra Defensive, Defensive, Attacking, Ultra Attacking), what you can do is go to custom tactics, edit one of those four, and paste tactics setup from "normal" so all the stats (players in the box, width build up speed etc.) won't get tweaked. Then go to the formation, choose the one you switch to in game, press triangle to put players in their own position and save.
Once you start the game, just change tactic to the one you just set up. In my case it's defensive; so it would say defensive but in reality it would be like normal, only formation change.
Please let me know if you have further questions.