Hi Ben,
Those plots cover quite a range of possibilities! Not exactly a lot of agreement! Frankly I would tend to trust Penepma over Casino.
On your suggestion to add spatial distribution output/plotting to the Penepma GUI, of course anything can be added, it's just more work!
That said, the Penepma GUI in Standard is really intended for a basic introduction to using Penepma. I wanted to make it simple so people can get started easily.
Do you have Pinard's pyPenelope GUI? It's a little more work to use but I think it includes options for spatial distribution output- not sure about plotting.
john