Since there is a new filter named “Looking for Group” with a nice yellow text, the messages for friends log in/out could be transferred to this group. Right now it is located at Game Messages with green text where you can easily miss it through the big list of salvaging items, or crafting 500 mithril bars, as examples.
Or, there could be a new filter just for loot to uncheck and clean the chat panel without disabling all the game messages.