Item Filter
You'll unlock Item Filter at rank 12 through regular Rank ups or through the Jade donator rank.
With Item Filter you can decide which items you want to pick up.
To add items to your filter you can hold the item in your hand and do [/itemfilter add], to remove the item hold it and do [/itemfilter remove].
Item Filter can be toggled on and off with [/itemfilter toggle].
Item Filter can function as either a whitelist or blacklist; you can switch between the two with the [/itemfilter switchmode] command.
You can also add items, remove items, toggle the filter, and switch the mode from inside the main [/itemfilter] gui.