Centrally managed password

Deal All,

We're  againd prepring customized packages and are stuck on unattended password.

We would like to have that password fixed for a client or random by default. With generated uattended package, after installation I get prompt to allow unattended access and have to type in password. can I centally manage such passwords? push some one or random password from console or have it "built" into msi package? I looked in rules but there is only password for meetings not for remote controll. 

I would like to have a setup where our technicians can login only using domain account (can be easly locked) and not having password to all computers after laving company.