Drop down menu of students to add/remove when making customized assignments, quizzes, and tests

It would be helpful if when I assign a customized lesson, that I could choose the students that get the assignment in a drop-down list, rather than go look them up in my gradebook to add them. I wish that there was a drop-down list of my students for each class and I clicked on the students that get that assignment, or remove students that don't get that assignment. This is so helpful for students with special needs and then for the rest of the class that would get a different customized assignment. This is true for all assignments, not just MathXL, but quizzes, and tests also.