No worries Ed. This is not on our immediate road map and we have no plans to add it right now. I have added it to our customer request log but I cannot make any guarantees about when we would be able to look into this.
We recently added the average power readout (on the zero-span AMvTime plot) as a query-able value via SCPI. See the ZS:Fetch command. If you can get this value to work for you, that might be sufficient. Otherwise see my prior suggestions.
