Policy on controlling NPCs?

[darksim0]

I was curious as to how you approach controlling NPCs during roleplay. I've seen some sites where admins or NPC accounts would have to control those characters and others where it's lenient enough to be controlled by the person directly in their post. Say for example, I'm haggling with a nameless NPC to buy some cabbages, would I wait for the admin to act out his part or would I just take care of that in my own post as long as I don't make him say "Take all of my stuff for free!"? Also, would that be approached differently from interacting with established characters, like if I needed to talk to Tarlok or Tenzin for whatever reason?

[The Avatar]

In the situation with the buying of cabbage from the Cabbage vendor, you can NPC freely.

While I would love to stay away from established characters, if the need comes up though simply just PM the interaction to a staff member for us to look over and to make sure it isn't off the wall.

I'd like for canon character interactions to happen as little as possible, if they must just try to keep them short and sweet.