Hi @hescalar,
Kindly please be informed that controlling a loop of the roster based on the previous response (question) is only possible through the xlsform and at the moment is not possible using the KoBoToolbox form builder user interface.
However, if you do not wish to control the roster based on the previous response (question) and would wish to have an unlimited loop for your roster you could do it as outlined in the support article here.
Regarding your other query on not being able to view the roster data in the server, please follow the instructions that has been discussed earlier:
Have a great day!