In the Kelemen plugin (https://github.com/kelemen/netbeans-gradle-project) it is possible to set global arguments to add to the gradle command line, as well as to the gradle JVM command line (Preferences \ Miscellaneous \ Gradle \ Scripts and Tasks). This is essential if your build scripts respond to custom parameters that you don't want to replicate across every specific project. The Kelemen plugin uses two textareas, of line-separated options. I don't see such a feature in the current implementation, though there are places in the Preferences where it could be placed.
This may only be useful for some, but for those of us for whom it is useful, it's essential. Until it's in place, our only option is to keep using the Kelemen plugin (which I have nothing against, but there must be a reason why there's s separate implementation on NB).