What i propose is simple: make some classes more appetible under certain pve aspects of the game while trying to avoid to unbalance them to pvp. I will try explain as following:
ROGUES
add new skill called POISON VIAL
Throw a poison imbued vial to a target point, dealing X damage (10%of ap+ 5% of agi) to all enemies in the point and 15 yards around it. [this is to give rogues a basic aoe spell for dungeons/raids. the damage should not be absurd, yet adds some flexibility to the class.]
HUNTER
Improved Eyes of the beast: rework it to give 5% damage bonus of pet (instead of 15%-30%) and each rank increases nature resistance of aspect of the wild by 10/20 points and damage against beast by 15% when track beasts is active.
WARRIOR
IRON WILL: add 2/4/6/8/10% more healings received from all sources (including first aid)