You tend to build some incredibly useful (if not brilliant) functionality into your software, and then seem to forget about it.
But is it documented?
I do tend to forget features I add, it's true.
Thankfully yes, it is documented. That's the key isn't it -- to document these things as they are added.
From the help page on "Special Search Modifier Keywords":
+sall
show all matching results, bypassing the normal limit on result count
+alias
match search only against aliases
-alias
do not show any matching aliases (only files)-history
do not give bonus scores to items in history
-.
do not show any files, only folders (and aliases)
-\
do not show any matching folders, only files (and aliases)
+\
show matching folders
+launchone
as soon as there is one (alias) result in the result list, launch it.