Batch user registration & set password?

I'm very new to OSTicket.  I've have just imported a csv list of 300 names and email addresses - ok so far.  I'd now like to register them all, set a default password and force a new password to be set for all users.  Is this possible to do?  SQL hack?   I don't want users to go through the registration process manually - just login and go.

Thanks,

DG