Truecrypt/Veracrypt uses something interesting during the creation of encrypted volumes: it asks for the user to move his mouse in random patterns for extra entropy. Could this be beneficial when creating an HD wallet for the first time? See this:

https://www.youtube.com/watch?v=cxo8xosH_TI&t=15m07s

Just an idea if someone is developing a wallet or if this could be implemented within existing wallets improving entropy.