Longer Auto-Lock Time#1028

Pleas consider to give us more options to auto-lock Opus One.

30 minute, 1 hours, 2 hours and 4 hours would be appreciated.

I lock my iPad screen every 4 hours to avoid always keying in password. Therefore, I hope you can extend the lock time longer for people like me who do not always enjoy unlocking and yet, prefer some security over none.

Thank you.