there are two issues, the first is if you want a complete listing of the deep recursive contents of the directory, the second is if you want to match a search inside the deep recursive contents of the directory.
the first cannot currently be done, though i could add it.
the second is done already (*at least mostly).
so if you want to find something at any depth under the d:\run branch of the directory tree, you could type:
note the SPACE after the d:\run because that is important.
* the only caveat to this is that farr tries to be a little smart and my memory is that it wont go deeper into the subdirectory if it finds matches in the top directory you specify.