It would be nice if there was an option to never reveal the bane. Right now you have a timing tell indicating you have at least 1 bane card in hand.
I just played a game where smugglers was the bane, and the curse pile was already empty. I really don't want to inform my opponent that I have a smugglers in hand when he has $8 and and is considering gold or province. Or let him buy a guardian if enchantress is the bane, etc.
Alternatively the bane could get a gladiator-like "Pretend to be thinking" whenever you don't have it in hand.