If you have all of your worlds setup with different types of gameplay but don't want to share the inventories between the worlds, you'll need to install a couple of plugins.
These plugins are Multiverse-Core and Multiverse-Inventories. Install both using the "BukGet" option in your Virtual Gladiators Multicraft control panel.
Once these plugins are installed go to this link to learn how to set Multiverse-Inventories up. Now you have inventories under control!