Hi Jim,
VMware introduced this into the API in 5.1, and they are still working on support for 5.1 in PowerCLI.
To get (and set) the information you are looking for at this point in time, you will need to communicate via REST to the vCloud API.
Here's a link to the API doc on the subject of resource intensive limits: http://pubs.vmware.com/vcd-51/topic/com.vmware.vcloud.api.reference.doc_51/diff/T2Api///operations/GET-OrgOperationLimitsSettings.html
Writing a couple functions should be fairly straight forward. Happy to whip them up if you don't know where to start.
Cheers,
Jake