Hi,
1. You can either use , in place of ,, or surround your text column which contains ,s with "s
2. It keeps the same order, I don’t see an easy way of re-randomizing the order dynamically. If you’re already thinking of limiting the loop to three cycles, maybe just include the practice subsequence three times in your Sequence (this way the three randomize will generate different orders), and use jump to directly reach the experimental trials for participants who pass, and let participants who fail continue to the next round of practice trials
3. Yes, I see no technical reason why you couldn’t do that. However some organizations like the IRB have policies regarding participants’ rights to take part in an experiment and/or being compensated for it, so double-check that your setup is consistent with any policies that govern your experiment
Jeremy