Yes, "printscale monthly" is probably the next feature. It should not be to difficult to implement.
We may considere also calendar week, but in that case, we would follow ISO convention ( https://en.wikipedia.org/wiki/ISO_week_date
). I don't know if it's fine to you.
We are also out of inspiration about the syntax. So it would really help if you could post here a simple example with the syntax you would like to have for weeks.