In AMT we have the option to upload a csv file (called the input file) where we can have multiple HITs (https://blog.mturk.com/using-csv-files-to-create-multiple-hits-in-the-requester-ui-22a25ec563dc). In CR we have only one hyper link. This is not convenient for experimentalists who need to run several experiments, each of which with a different link because this means creating a different survey per link. In our case, for instance, this would mean creating 4000 surveys.... So I think it would be a good further development for CR to implement something like this as well.