The PowerShell Toolkit 9.6 FAQ has some information on support and enhancement requests:
How do I Get Support for PSTK?
Answer: PSTK is supported through community discussions. You can post your queries on ONTAP Community Discussions and SANtricity Community Discussions.
How do We Submit Enhancement Requests?
Answer: Please submit these requests using the community discussion described above.
As to your shelf question, a couple options come to mind:
1. The Cluster Viewer component of Active IQ, which can show you a Stack Diagram that will include a diagram with shelf IDs, serial numbers, disks, etc.
2. The Visualization portion of a Config Advisor data collection job (Run data collection for the cluster in question, click on View & Analyze, and then click on the cabling diagram under the "Visualization" header. *Note*: You will need to check the box to "enable visualization and device details" within the Config Advisor settings menu to get this data