Email to Individual Event Attendees

It would be helpful for the emails to attendees within an event to have a few more options on who to select. For instance, we have a camp out and I sent an email to everyone coming. I would like to send a different email to the attending adults as their instructions are different then the girls. It would be nice to have options such as attending youth or attending adults. It would also be helpful to have check boxes of the individual attendees to select for crafting a specific message, such as those who are past due on payments. This way I am not spamming my members with irrelevant details.