[Freeswitch-users] faxing and file permissions

When faxing with freeswitch the directory and containing file need to be readable by "other". Otherwise, mod_spandsp complains about the file being inaccessible. You can also see on mod_spandsp wiki people doing chmod o+r $TMPFAX. Why can't this be run under the freeswitch user only, so that you can do basic access control?