now you can use
/sm or /servermanager

/sm help - Shows the menu
/sm jars - Shows all available jars for creation
/sm console [server name] - Shows the output of the console
/sm start [server name] - Start a server
/sm stop [server name] - Stop a server
/sm delete [server name] - Delete a server
/sm command [server name] [command] - Send a command to a server
/sm create [server name] [jar id] [port] - Create a server