What obscure mechanic should become a standard MMO feature?

Over the weekend we learned that The Repopulation will be implementing some sort of Entertainer skill set that is at least partly inspired by similar mechanics in Star Wars Galaxies. SWG's signature non-combat profession is still unique in MMO annals, though, and we got to wondering if there are other nifty mechanics that should be revisited in newer games.

What do you think? Is there a particular class, system, or MMO mechanic that you'd like to see become an MMORPG standard?

TH

Well, i really enjoyed the Warlock class in WoW, where you had all these amount of DoTs and abilites that could suit your preference.

You like casting spells to more single targets? Go Destruction.

You like going mainly Dot against your foes? Go Affliction

Or the last but not least, You like going massive AoE, Devour cunts with your demonic abilites? Go Demonology ( My absolute favorite class Talent)

I really enjoy the way where you have these choices to be whatever you feel like, sometimes you cant obviously be a ranged if you are a mainly a melee or Caster going melee, but overall with the talent ways its a nice way keeping the shit fresh

overall, Having as much choice as possible to that class you are, but still keeping it the feeling of the class you are, and not make it too identical to other