Sorry for bringing this old topic up - but I disagree and would surely appreciate a feature that auto-dismounts volumes before standby or hibernate.
I don't see why I need to encrypt my whole computer if all sensitive data (including my browser profile btw) is encrypted on the machine. I experienced trouble with whole-disk encryption and, therefore, would prefer the BoxCryptor solution with auto-dismount.
I would be glad to discuss this question with you.