Oops! Sorry, I forgot this (yes, PC-BSD creates these symlinks...). I'll release a new version of the script this afternoon with this bug fixed. In the meanwhile, you can perform the benchmark if you create the symlinks.
The other problem that you have reported does not happen on my PC-BSD machine. There should be no differences in this case, so I don't know why this happened to you. Anyway, you can select SCRIPT > Feature Scripts and then click Add to add the script to the main menu.
Sorry for the inconvenience.