The vanilla particle flow material support, IMO, is stronger than shape support, materials are much easier to carry/assign downstream than shapes in vanilla pflow. Box#2 some improvements were made at the local container level that make it even better/easier to define. Of course Box#3 hands down for the most control/speed in pflow currently possible for both materials and shapes (and everything else for that matter
).
About the evaluation thing, I can’t speak for Oleg, I believe he just wants to know exactly who he is sending evaluations out to, I imagine to minimize the chance of piracy, since AFAIK they are full-version time restricted demos. You get 30-days no holds barred evaluation.
About the Scale, you could birth script this and when assigning the material you could also define the scale of the particle, as another option. It we be a little bit slower due to the script evaluation but it shouldn’t kill it speed wise, you can regain most of it with the addition of a cache operator (with the exception of the first run as the cache builds).
Sorry no help with the pWrapper issue, their forum is pretty dead too, ie the developer doesn’t seem to visit that often, maybe try e-mailing them.