Can I play with and without the Trainer in other words turn it off while in multiplay
If you are using a trainer in singleplayer/offline and then want to play multiplayer/online, you should definitely restart the game without the trainer or Aurora running in the background.
Can I play with and without the Trainer in other words turn it off while in multiplay
As long as it's a new save/character. Using the trainer first and then going online with that save or character counts as using the trainer online.