Just a note that we posted a new beta build.
It will require a new license, but you can play with it in evaluation mode over the weekend until we can send you the new licenses.
We added the new dynamic PFlow operators to the build, and also included a Geometry Test operator which is similar to the culling in PRT Loader, but can be used in any flow to select particles inside, outside and/or close to a surface. The particles can then be sent out to another event, for example to be deleted, or affected by any other operators. While they appear to be working nicely, please look out for bugs as we haven't really used them much in production yet.