More information that would be useful includes

• contact details for the JobPosting (this may be different / more specific than the general contact details of the hiringOrganization, may vary by the job on offer)
• an employer overview, information to attract people to work for them, e.g. what they are like as an employer. Again, this may be different to the description of the hiringOrganization for general consumption.
• a standard code (e.g. NAICS, SOC) for the industry, currently the industry property only accepts text.
  The second and third of these have been piloted and found useful by the JDX project; All three have been discussed by the TalentSignal W3C community group (see mail list thread on TalentSignal properties relating to employer information) and summaries / proposals on wiki: Job contact details, Employer Overview, and idustry code.