Make new files stay in the parent folder, when the folder on the cursor is closed

[booperlv]

Creating a file here:

parent
  folder (cursor on this line)
  file1
  file2

results in

parent
  folder (cursor on this line)
  file1
  file2
  created_file

but when the folder is opened:

parent
  folder (cursor on this line)
    folder_file1
    folder_file2
  file1
  file2

creating a file would result in:

parent
  folder (cursor on this line)
    folder_file1
    folder_file2
    created_file
  file1
  file2

Already created something that implements this same functionality:
But before I open a pull request, what should the option be called?

[booperlv]

Feature added #628 :)