Some of the other recommendations on this thread said it but I think they all tie in together. The habit feature would be so much better/stickier if we could...
1. Write a description/outline for custom habits when we program them into clients calendars.
2. Attach a custom video/icon to that habit.
3. Edit habits on the fly in the clients calender. If we had them adding 2 cups of water a day, we should be able to add another two without cancelling the habit. It's all part of developing the same "skill tree" and I'd like to see their completion % over a longer timeline for each macro habit.