Training Mode
This game is going to eventually have real clan matches, we all know this. I was playing a small indie title by the name of "Guns of Icarus" on steam for awhile and the training/practice mode they implemented was outstanding for training players. You could damage items on the ship, setup targets, enabling your crew to drill for matches and formulate game plans. For MWO, we already have the training map but adding features such as the ones I have discussed would be incredibly helpful to clans and players.
Spectator Mode
In games such as LoL or Dota 2, you can easily spectate a match of one of your clan members or friends, and this has become a great training/learning tool for many.