This is an undocumented feature and I guess Software AG would have the enable it in the Solaris version. I believe it was put it for useful timing during development of Tamino. A nice but undocumented and therefore unsupported feature - one that may disappear in some future patch level.
I would suggest talking to Software AG and see if they will implement it for the Solaris version and make it a formal (and very useful) feature.
For timing Tamino I would have a look at the web logs as these timing are more real because these give the round-trip time to process a query whereas the times from _duration are just the times inside the Tamino database.
#webMethods#API-Management#Tamino