More 'Betime Mode' options?

I feel like I'm missing something obvious, but the Betime Mode options seem painfully limited. I want to have it awake from 5pm to 7:45pm, but aside from the slide only moving in 1/2 hour increments, it is evidently only possible to have the sleep start time before the end time with a noon-to-noon window. Would also like to have the ability to add a second awake time for a short time in the morning.

Finally, the Sunday-Thursday option is also a problem, as I don't want it to turn on until after 5pm on Friday, but don't want controls in place for Saturday