Hi,
there should be no difference in available ESXi shell commands between vSphere Hypervisor and paid vSphere editions.
The main difference is that "free ESXi" -> vSphere Hypervisor have its API only for read only access which limits/prevents
remote management of that hypervisor using vCLI, PowerShell, Perl ... (including vCenter and vMA)
Can you please post what commands you missing in ESXi shell?
For list of available command line interfaces refer to this list:
http://pubs.vmware.com/vsphere-60/topic/com.vmware.vcli.getstart.doc/cli_jumpstart.3.2.html
For list of available vCLI commands go here:
vSphere Command-Line Interface Reference
Entire vCLI documentation:
https://www.vmware.com/support/developer/vcli/