I first selected IB (demo) in Zorro and run a test of z12. Saved the z12.txt log.
Then I selected Oanda V20 in Zorro and run a test of z12. Saved the z12.txt log.

Comparing both files in Beyond Compare reveals that they are identical. This suggests that Zorro did not actually apply broker specific parameters to the two tests. (Since IB offers less leverage I would have expected a different return rate or at least bigger capital requirement in the log.)

Therefore the question:

Is there a way to test the Z systems with specific broker parameters?
Perhaps I can manually find out broker parameters somewhere and set them in Zorro before hitting the test button?
If possible, how do I do this?

Thanks for any suggestion!