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Not possible for Find My iPhone due to security reasons. The rest ofyour passwords are automatically saved if you used the official dedicated app. For isntance, use the Yahoo mail iOS app and log in once. You would not need to log in again.
Since iOS 6, you no longer need to enter your password when updating or installing apps on your iPhone once you enter it the first time. This is valid per session - i.e. if you turn off and on your iPhone, you'd need to enter your AppStore password again.