This tab of the Sign Code action specifies additional signing options.

 

Don't sign if already signed: If checked and the file is already signed, it will leave the existing signature.  If unchecked, the file will always be signed again.

 

Retain original modification timestamp: If checked, after signing the file, its modification date+time will be restored to the value it had before signing.

 

Show certificate information: If checked, the information about the file's digital certificate is logged.