Passing command line arguments to javac in IPR runner?

Is there a way to pass command line arguments to the javac call inside the IPR runner? It's hard to tell if real javac is even being called, or another wrapped compilation similar to what IDEA seems to do.

I would love to pass into javac from jdk7:

-XDignore.symbol.file

to get around some classes which aren't present in ct.sym but still exist in rt.jar in code that can't be refactored at this time.

The usual "JVM arguments" section of the runner doesn't work for this option.