open ended/customizable appointment times

I am loving the use of the appointment calendar, and it's so much better being able to add more than one dancer. I would REALLY LOVE to be able to customize the times, just like when I'm creating an event. Sometimes the rehearsals are 30 minutes, sometimes 45 minutes, and I'm even using this feature for when I book parties, etc., and would love to be able to just type in the time of use, whether it's 9AM-9:30AM or 2 PM -5 PM. Thanks for all you are doing to make these upgrades!