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Add more banshees as enemies
The first and only appearance that Banshees had in Baldur's Gate where on BG2 ToB, as minions of the Lich Vongoethe in Amkethran (Balthazar's city), and that's the only place Banshees have been spoted on the game.
The artwork is already avaliable, the monster is already coded, and we're still going to feel the extension of it's use as a new monster added. My suggestion is to make a banshee a major enemy in some specific side quest that can be made at the end of BG EE or at the begin of BG 2 EE, and after that add her as a more common enemy in later places of BG 2 EE.