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1) root and if you have uid as 0, it will not prompt for any passwd becoz it's a root account.
2) su from one normal account to any normal account, it will ask for password always
I don't think so, we can get something by default to achive this for part 1
BTW, can you explain why you want passwd to be asked while su to normal account from root?
You would probably need to fiddle with the pam.conf file and set it up so that a password is required.