I am sorry but the "supercalendar" was not upgraded to 1.5.3. Stuart Mayor did a great job by transforming activities linking hack in a real module with a user interface called activities locking. Regulated rights ( alas supercalendar ) was not included at that moment.
Including it should not be a very long job but now I am concentrating all my small developpement efforts on that using Stuart activities locking as it is now.
If you or other want to add "supercalendar" features to Stuart activities locking, I will be pleased to help to do the adaptation.
I hope it may help,