Sometimes you just want chat turned off. You cannot message a player with their chat turned off, but you can still mail them.
There could also be settings for, see friends only, guild members only, etc. This will basically put everyone except the people you decide on ignore and it won't show updates like when you pick up a material or other item in a level.

Allow us to favorite various items in our inventory. This will act like a bind which you can disable and enable at any time. Preventing you from trading the item or selling it. You will also be able to sort your inventory by your favorites. If you favorite an unbound item, it will prevent you from equipping it and binding it. This will be very useful for those pesky mis-clicks!

Overtime, we accumulate lots of items. What if we can have different inventory arrangements? It'll work like load-outs. When we make a new arrangement, we get to choose which categories are enabled and disabled, and the order that they appear in. When we sort by our custom arrangement it will do just like we say. If you want to take it a step further, allow us to pick individual items for arrangements.

Example: I make a custom assortment to only show accessories and costumes.
Example 2: An Assortment which only shows the player's favorite weapons.

Sometimes our mail just gets too cluttered, and removing it becomes a pain, this will ease the pain.

Sometimes you need to send the same mail out to many recipients.

Show us the history for all the trades that we have done. Sometimes it gets hard to keep track of where our money went! Will be a tab in the mail section. You can delete transaction posts or disable them if you want. Auction sales and purchases appear here too.