This is really awesome, my suggestion is sound/text warnings on Strongboxes and Corrupted Areas
Strongboxes shouldn't be too hard because you already show them on minimap
Strongbox - Path of Exile Wiki
About Corrupted Areas, I don't know what your hack has access to but if you can read the instance portals you can probably warn if anyone matches with the following corrupted zone names.
Corrupted Area - Path of Exile Wiki
EDIT: Disabling Life Bars on Towns.
EDIT2: Alert for 6Sockets
EDIT3: Different HP Colours based on monster rarity. Adding a 10% Marker on the life bars so it is easy to see if it is within culling range.
EDIT4: Magic/Rare/Unique Monsters with bigger size on minimap and maybe lifebars. Warning on Inner Treasure and Wealth monsters.