Since there is nothing against double posting and this reply should appear in the unread replies of the op.
Regarding the unbind command, add specified command, which is /unbind key command.
Because /unbind key removes this key from every command in the bind list. Which removes the default binds too (Imagine someone bound a command to 'Z' and wanted to remove it, if he used "/unbind z" he will lose some of the basic commands like opening an information' markers or the shop' markers) so this actually will make him suffer finding the bind for it.
Also,
Add /ca for contact admin, /room for chatrooms, /sms name for sms, /re text for replying to a message, /say for country chat, /teamsay for team, /r for pilot radio and /messenger for the sms GUI.