since the same features (smart stay, etc) work even when using a custom launcher i am assuming it's NOT part of TouchWiz since you wouldn't even be using it. i am just suggesting the features, like SVoice and S-Notes, might be separate APKs. i never used them so i never cared to back them up.
Samsung Galaxy S3 (Stock, rooted TouchWiz)
Samsung Galaxy Tab 3 7.0 (non-rooted, stock)
Samsung Galaxy Tab 2 10.1 (obsolete, slow, rooted)
Samsung Galaxy Note 10.1 2014 Edition