If possible, please add the option to spawn 1-3 mobs from the game in Training (does not have to be every mob if you want to keep some novelty in an experience of first encounter). This helps folks practice understanding what they will encounter, notably bringing in new players.
Additionally, some sort of damage in the training room would be helpful (could be the mobs, or a turret that keeps firing in a direction/range) so players can practice utilizing heals/rezzing.
Lastly, having an option for dummies to move. Moving randomly, or doing a loop around the room would be helpful for targeting practice and understanding some abilities (tether, etc.).