1) Add more / commands.
Examples:
/afk (so when someone messages you, it auto replies with 'Im sry, im afk.),
/inspect <player's name> (incase you cant find them. Or does /trade let u do this as well?),
/follow <players name> (not sure if too good of an idea)
/muted (automatic turn on when u get muted, could be like a light or something above your head)
2) Have CS noticfications. (when one of your items sell or get expired)
Bookmarks