Anyway to add in option to IBM command ?

I wonder anyway to code a new option to an existing 
IBM provided COMMAND. Is there any interface to do so
?
For example, i want to add in an option to do CPYSPLF 
when user in the screen of WRKSPLF ?
Anyway can make it in RPG, RPG IV, CL, C/400 , even MI
?



 Screen (WRKSPLF)
 =======
         Work with All Spooled Files 

Type options, press Enter.         
1=Send 2=Change 3=Hold 4=Delete 5=Display 6=Release
7=Messages 8=Attributes 9=Work with printing status

                    Device or               Total
Opt File     User    Queue   User Data Sts  Page  ...
 _ QPJOBLOG  USER  QEZJOBLOG   MIS015  RDY  1  
 _ QPJOBLOG  USER  QEZJOBLOG   MIS015  RDY  1  






  Koa






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