Hi Renato, in answer to your questions:
1. Yes, JobRoller uses the native WordPress user functionality to manage user accounts.
2. There is no current rating system for users in JobRoller, or plugins available in the
AppThemes marketplace that can be used for this purpose.
3. This is also not a feature of JobRoller, so would require customization on your part if you were looking to introduce such a feature. JobRoller is not encrypted, so technically you can make any modification you wish to the theme.
4. The job listing will only disappear when the listing expires, or if the employer removes it from the dashboard.
5. Not by default, at this time JobRoller is our only theme which has 2 different registration types.
Thanks.