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In 5.1 - You can use different usernames for Twitter, Instagram and Snapchat

Hasn't arrived in the UK yet. But when it does in March, I plan to look into this.

Could you direct me to some examples please?

You can already record voice calls. But using an MP3 file is another way that would be good to add.

As per the release notes. This has been temporarily removed due to major crashes. It'll be back soon.

Passcode has been removed and uses solely Face/Touch ID else device passcode in 5.1.

This is very strange. What iOS are you using?

Have you tried reinstalling?