1. This is not a default feature of the theme to allow this, but it could be done through customization on your part.
2. JobRoller includes a custom forms functionality which allows you to build your own job posting form with the fields you wish to include. You can see this on the
JobRoller admin demo here. However, information such as the job description field are still included as they are by default, so you'd need to modify theme code to change the required field status of this particular field.
3. There is no option in the JobRoller admin dashboard to remove the button, so this would also require customization to remove it.
Our themes are not encrypted, so you are free to make modifications if you wish. AppThemes does not offer customization services, however we do have a
certified partners page where you can find developers for hire who are experienced at working with our products. If you make contact directly with an outline of your requirements, they can provide a quote for the work. Thanks.