I have attempted on many occasions to obtain advanced authoring keys; however the support e-mail specified in the software does not respond to such requests.
Please modify the software to not promise responses from this e-mail; as well as confirm the exclusivity of such keys. They do not, as the software suggests, respond “within 24 hours.”
Since about a year or so you can access the shader authoring options without the need for an extra key. Instructions how to enable it and a short introduction can be found in the vorpX help.