Add a custom data column to student roll tables

In a screen like the image attached, showing a class roll, it would be great if we could add a custom column to the roll table. Perhaps a simple "Add a Data Column" button that is implemented with the Class Roll template. Then, we users could select what that data is that might be displayed or simply enter it and save it on the spot. For example, in my karate classes, it would be great if I could have a "Belt Level" column when I look at the class roll for a Karate class. Then, I could quickly and easily see who is what level. Or I could have a column for a specific need at a certain time of the year. It would also make sense that the column would print with the Print Class Roll option (or not - perhaps make that optional).