Drop Ins Included in Max Number of Students.

Hi, We need a way to keep drop-in students from causing classes to be oversold since you can not put in a number of how many drop-ins are allowed and they are not included in the Max Number of Students count. To avoid overbooking a masterclass, we need drop-ins to be included so I don't have to go in and change the max number of students so we keep our class at our max. Some masterclasses we hold are mandatory for our company dancers and we have a limited number of spots available for a drop in. During our summer masterclasses, we have students that sign up for the entire program, and then some just drop in.