Clover call runs out of pergen space and no possiblity to increase in hudson

clover uses a lot of permgen space. Our project has become too big to fit into standard permgen space, therefore we need to increase it. "Additional properties" does not take any -X arguments since they have to be set in MAVEN_OPTS environment variable.
There should be a possibility to set MAVEN_OPTS as in the normal Maven build in hudson (see attached screenshot)!

I will try to submit a patch in the next days/weeks up to then I will have to stick to cobertura