But @starmech, you are wrong if you tell Wanikani “the word for cow, 牛, is pronuounced ぎゅう”. It is wrong to say that cow in Japanese is ぎゅう.
I really don’t think there is a script like that. Maybe you’re thinking of the Android app? The Android app does this, for kanji questions. Because in kanji questions multiple answers are technically right.
EDIT: you might wanna check out this thread