Global Settings

Hub Transport Role - Organization Node

TechNet page 

General tab
Transport Limits
Maximum receive size (KB)
Maximum send size (KB)
Maximum number of recipients

Transport Dumpster
Maximum size per storage group (MB)
Maximum retention time (days)

Message Delivery tab
Enter the IP addresses for servers deployed in the perimeter and the range of IP addresses of your organization, which will be ignored by Sender ID and connection filtering
<List of Remote IP address(es)>

Enter the delivery status notification (DSN) codes. DSN messages that have these DSN codes will be forwarded to the Microsoft Exchange Recipient
<List of DSN codes>

Wanted: cmdlets equivalents