You can clone with
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This line: https://github.com/nicksieger/ci_reporter/blob/master/lib/ci/reporter/rake/test_unit.rb#L12
Will set the TESTOPTS environment variable.
In rake 0.8.7, the only valid way to pass options was the env var TESTOPTS https://github.com/jimweirich/rake/blob/rake-0.8.7/lib/rake/testtask.rb#L123
In rake 0.9.2 you can go crazy with variations of this: https://github.com/jimweirich/rake/blob/rake-0.9.2/lib/rake/testtask.rb#L105
You can also, in both versions of rake, set the options attribute with a string, but this will be ignored if the ENV VAR is set.
I think this means that by including CI reporter options set programmatically or with a different name will be ignored.