I would really like to see the limit lifted as well. This is indeed very limiting while it seems that the solution (listing all files when hitting [[ in editing a note) the solution is already there.
I would even ask what is the point of the seperate search option if it all can be included in the quick switcher (which might not be the best name at that point 
).
Something that for example CintaNotes does very well is that almost everything is done from the search bar.