[sudo-users] Ask root password only for one command

[Salatiel Filho]

Is there a way to make ONE user needs type root password for just one
command of his list of allower commands ?
Example:
User nobody can run ifup , ifdown , ifconfig
but i also want to be able to make nopbody run "sudo su -" but in this
case i need to type root password instead of nobody''s password .
Any ideas ? I know there is rootpw option , but i dont know how to
make it work for a single command .

-- 
[]'s
Salatiel

"O maior prazer do inteligente é bancar o  idiota
   diante de um  idiota que banca o inteligente".