Ah, you meant individual deadlines for particular students! Well, to be honest, this has never be planned for the Workshop. You know, Workshop is not Quiz. In the Quiz module, the student's input (attempt) does not influence the others. But Workshop becomes really complicated when it comes to individual exceptions. Someone should probably assess late submissions - meaning that they have to be allocated for assessment. But once you allow extra time for submitting, you must allow extra time for assessment. And because we need all assessments done for the calculation of final grades, late submissions effectively block all workshop participants... That is why even late submissions obey the phase of the workshop and therefore the availability of the individual deadlines was not seen as important.