Customizable immunization dates

In the immunization section, it is preprogrammed to show that a child is due for an immunization at certain time frames. It would be helpful if there was an option to program an alternate due date. For example, if a child is due for DTaP, MMR, Varicella and Polio between 4 and 6 years, it shows that they are due as soon as they turn 4. Those immunizations are requred to attend Kindergarten, which typically does not start until 5 or 6 years old. I would like to schedule an alternate due date on a case by case basis. Pediatiricians also occasionally give an alternate date for immunizations, meaning that it will show that it is due, even tho the pediatrician has scheduled it.