In answer to your questions:
1 - There is no setting within the themes admin dashboard to edit the resume form, however you may wish to check out the
FXtender Pro plugin which offers some of what you describe.
2 - Once a transaction is completed, the job listing will publish automatically if you set it this way, or you can allow moderation of posts before they are published if you wish.
3 - There is currently no slider plugin for JobRoller available in the
AppThemes marketplace so it would require customization on your part. Thanks.