Kind of tangential, but I've been looking for a place to mention this. I discovered a nice trick that helped me with saved searches. My (partial) saved searches section looks like
Working @search(@na or @today or @due <=[d] today +24h or @stack///*)
Write @search(@write and not @wait and not @done)
Edit @search(@edit and not @wait and not @done)
Due Today @search(@due <=[d] today +24h or @today)
Soon @search(@due < [d] tomorrow +7 days except @due <=[d] today)
The ---- lines show up as dividers in the sidebar, which helps me a bunch with visual distinctions. I have sections for "figure out what the hell you're doing", "pick based on what you feel like working on", and "crap what did I forget". Roughly.
I save my searches in the document, but, given what @GuiB said above, it seems like this would likely work for externally saved searches as well.
Hope someone else finds this helpful.