In addition, I would like to have the ability to assign an entire module to some students and a different module to others. Right now, I have (quite clunky) workarounds to enable some students to work...

This is a fantastic idea and Canvas should develop it ASAP!

Please add this to Quizzes. I will not even use this question type until it is added. The time spent is better used evaluating an open-ended answer to a more complex question. 

I agree that this is a very important feature to allow for individual needs, such as leaves of absence. 

One thing that has worked for me is to create a category called Assignment Bank. I put any assignments I want to keep around, either for possible assignment later in the course or for future semesters...

In addition, I would like to have the ability to assign an entire module to some students and a different module to others. Right now, I have (quite clunky) workarounds to enable some students to work...

This is a fantastic idea and Canvas should develop it ASAP!

Please add this to Quizzes. I will not even use this question type until it is added. The time spent is better used evaluating an open-ended answer to a more complex question. 

I agree that this is a very important feature to allow for individual needs, such as leaves of absence. 

One thing that has worked for me is to create a category called Assignment Bank. I put any assignments I want to keep around, either for possible assignment later in the course or for future semesters...