In addition to the CONTROL card and other options in 'feff.inp', some parameters in the files read by the various modules can be changed. For example, you can create your own paths by editing 'path00.dat' and explicit change Debye-Waller factors in the final result by editing 'list.dat'.
Users may edit the some files as a quick and sometimes convenient way to prepare a given run. It is easiest to use an existing file as a template as the code which reads these files is fussy about the format of the files.