Multi-world support has been added. Now you can disable a mob in a specific world with the command: '/smd disablemob <mobtodisable> <specificworld>'. If you want to do it manually in the config file you can do it like the following way: 'MOBTODISABLE*world', the worldname is case sensitive. If you want to enable a mob you can type the command: '/smd enablemob <mobtoenable> <specificworld>'.
The commands have been moved to different classes (this wasn't possible before, because this plugin uses subcommands like 'smd <subcommand>'. First I had to create an alternative command system). This results in a higher efficiency and it is easier to read for me.