New features:
/bounds options (bound id) and
/bounds scoreboard
/bounds options (bound id)
This new command shows a GUI to the player, where they can set the enter and exit messages of the specified bound. How this message is shown to the player can also be set to either 'off', 'chat', 'title', or 'action bar'. The GUI has a bit more functionality which is explained in-game. If any other options are requested, I'd be more than happy to try to add them.
/bounds scoreboard
This new command toggles the player's bounds scoreboard. The scoreboard currently only displays a list of bounds that the player is currently in. There are plans to add to this later.
Updated features:
/bounds info (bound id)
The command above has been updated to now include the enter and exit messages, as well as the type of message that would be sent.
Known issues:
/bounds resize (bound id) full
The command above is currently bugged and will probably not work. It will display in chat that it has indeed resized the specified bound to the height limits of the world, but it will not. This is a bug with SkBee, which has been bought to their attention and should hopefully be fixed in their next release.