I think you are getting somewhere with some of your ideas. If anything is going to get added it has to be something no one else can do. Some of us think bards should be able to put people to sleep with a lullby song, but to many other classes can already sleep mobs/players. The idea of a good knight being able to protect group members better then other classes does make sense. greater shield mastery - this skill is passive and automaticlly upgrade shield mastery. A good knight will randomly block attacks with his shield for group members.

Example:

Frychu deflects the many-eyed sea creature's attack with his shield, Brywing is very thankful.

Frychu aids Brywing and deflects the many-eyed sea creature's attack with his shield!

Now that would be sick.