Permission to use the panel can now be anything, it is not limited to 'Default' and 'Admin' (default is still used to give the perm to everyone by default)
The item can be changed to something different if someone doesn't have the right perms for the item (eg. if you didn't have /gamemode permissions, make the item a barrier instead of a gold block)
The command usage doesn't show up when there is no permission for the panel
