Mobile Account Creation

Greetings! I would like to start using portable home directories this year. So far everything works pretty good and a user can login and get their home folder created. I am interested in automating this process - currently we have all local only accounts and would migrating their data to the new account. So I guess I'm wondering two things: 1. Can I create a portable home directory without knowing a users password, then later sync up their account? I think I remember reading somewhere I can create a local account, then delete the user leaving the home behind. Would I use dscl -delete for this? Are there better ways to do this? 2. How can I make a mobile account an administrator on that computer only? I know I can select the account after it's created and make the user a Mobile Admin in System Prefs, but can i do this before the account is created somehwere or with dscl after it's created? Thanks for any info or links you can provide. ~Steve