If I bring up the file property window and press the "Recursive" button, xffm
spawns a chmod command in the background with an octal mode argument. All files
and subdirectories are chmod'd identically. This is usually the wrong thing to
do because the user is looking at the property of a directory, so all files
would become executable (because a directory is useless unless it is also
executable).

If the user pressed the Recursive button when the property window for his/her
home directory is shown, xffm would quickly screw up the permissions of lots of
files and directories (e.g., ~/.netrc, ~/.ssh, ~/.gnupg, etc.).

Also, there is no warning or explanation for the Recursive button. This does not
seem to be reasonable for a button that can have such serious consequences.