[galaxy-dev] Which version of GATK work with Galaxy?

When I use an old version of GATK, it failed with a report "-nt" option was not supported, I guess old GATK does not support multi-threading. If I use a new version of GATK, it failed with a report "-et NO_ET" need a key file to work since new GATK force users to report usage unless we obtain a key file, but it seems no place for galaxy to specify the key file. Any help? Thanks, Frank