I'm sorry I don't know Nozbe, but I use Toodledo, and in it I set a "start date" for something I need to be tickled on, and then hide all tasks on my lists that are in the future. That task then will not show up until the day I intended. If there are files, I put them in a manilla folder and put that with my project support material, and reference the title of that file in the notes of the aforementioned task.
I don't know if Nozbe is similar, but thought that might help.
That's interesting. I haven't played with filters. I'll give that a go.