Flex period vs activities#1969

I want to be able to create a Flex Period for a recurring time and then have individual activities determine which specific day(s) they are available. If an activity is set for only one day, I expect it to appear only on that day rather than being tied to every day of the Flex Period. As it stands, I would have to create an separate flex period for every day of the week separately if I want the activity to show up on just one day for kids, otherwise it is confusing and they get notified thay have to sign up today. And/or…have a one-off activity that can be created for kids to sign up for without needing to create a flex period first. Double work.