rrix has a thread posted about how to use the ItemList.
You can set what items you want to keep or discard based on the item rolls.
To get started, just open up the Trinity config from the plugins tab.
Click on the items tab once inside of the trinity settings.
If not on the ITEMS > PICKUP tab, go there first. There is a dropdown menu under ITEM RULES MODE.
**Change this setting to ItemList
Now click on the ITEMS > ITEMLIST tab
*Set all item rules to what you want.
There is also an import/export option and you will see many people have their lists posted.
Just remember that if your still doing basic gearing, some people's list would exclude things that might otherwise help you get geared up faster (IE They only save the best rolled gear)