Tag items as important, highlighting them visually. Now with sound!
Adding and removing items to and from the list of very important items can be done in the plugin's configuration window and by right-clicking items in the game. Very important items get their name highlighted in the tooltip, and a sound effect plays in addition to that to ensure you've seen its presence.
/xlsettings, open the Experimental tab, and turn on Get plugin testing builds. This plugin is only released as a testing build, so it won't show up in the installer until that setting is on./xlplugins to open the plugin installer.