I have it enabled so my players keep the items in their backpacks. However some items I don't want that to happen can you please add a drop item whitelist so I can prevent players from stashing C4 and other big items in the backpack?

Sure, I can add this. I anticipated this would be requested eventually. I somewhat recently added similar capabilities for the keep-on-wipe feature, and I'll probably use the same config structure for this feature.

Awesome! No rush after I submitted this I realized I can achieve similar results with the restrictions config.