We are redesigning some of our layouts and want to be able to move entire collections to new pages/subpages. We have not seen the ability to move a collection like you can move a card. (Go to the wrench, select move/copy, then select the page you want to move the collection and all cards within that collection). That would save a lot of time.
Similarly, if we duplicate a card we are given an option to select the page you want it to go to. One improvement that would save us some time is the ability to also select the collection as well. This would allow us to move the card without then having to go to the new page and drag the card from the bottom (uncategorized) to the collection. We think it would be cool to have the option to assign it when we are duplicating the card/page.