Quest Widget
Bazaar History
Widget to preview gear
Teleporting NPCs (or portal monuments)
Various means of travel outside of traditional "airship"
Map Toggling with mouse click
Popup boxes for: Trade, Invites, etc.

Large Scale Battles (similar to guildwars 2)
Environment interaction (similar to...guildwars 2)

Pets
/check Message

MOTD for LS's
Level/Location of LS members in ls widget

Dynamis/Campaign type content

all i can think of.