Would be nice to set different calorie goals suiting different day diets. For example 5/2 diet of ~2000cals for 5 days and ~600 for 2 days. Or other combinations that suit fasting or calorie cutting. An idea anyway!

I'm with terado. I watched the Horizon program and am giving the 5/2 diet a shot (it's amazing what you can eat for 600 calories if you put your mind to it)!

Also, I know a lot of people who like to eat a little less during the week and more at the weekend so being able to change the day's calorie level would be useful there as well. It's no fun being told you are under-eating and the damage it can do!