Any plans for when you will be able to encrypt the wallet? Seems strange, that is not possible. Never heard of any other local wallet, that cannot be encrypted.
Hush is a fork of Zcash. Wallet encryption is disabled in Hush because it is disabled in the parent Zcash code-base.
See: https://github.com/zcash/zcash/blob/master/doc/security-warnings.md