When you are in Timepage it would be really beneficial to know what tasks you have not scheduled. I realize that you may want to keep the lists at a minimum but perhaps just have a quick entry to a List that does not have scheduled dates/times on them. That way if the user has spare time they can just click and it would take them to that specific list to see what they may be able to accomplish on that given day (or the next).

For example: in my Actions I have a "Bucket" list (sort of like an Inbox if you will). There could be a button that would go to that designated list. You could specify that unscheduled list either in Settings or allow them to choose like you currently do in TimePage.

The idea is to minimize having to go back an forth from Timepage to Actions. Anyway, just a user here with a suggestion :)