can wallet introduce offline mode and passphrase

hi,there! I am very happy to be part of the community.And I love the trust wallet very much.The UI interface is very beautiful.I want the wallet to be better.I think these functions would be better:
1.Can i use trust wallet in the offline mode.This means i use one celephone as offline wallet and another celephone as observation wallet.I think this would be much safer.
2.Can we introduce the passphrase.it means that when we create the new wallet,we also need to type a phrase to generate the wallet.Even though when someone else know my recovery words,but they don’t know the phrase,they still can’t get my assets!