I’m not sure what commands and options you are refering to as CHGSPLFA is the command and not a ‘work with’ style interface, but you could customize the behavior of CHGSPLFA using the <a href=”http://publib.boulder.ibm.com/infocenter/iseries/v5r4/topic/apis/xcachg.htm”>Command Analyzer Change Exit Program</a>capability of i5/OS.
Providing integrated solutions for the System i user community
You are probably remembering the <a href=”http://publib.boulder.ibm.com/infocenter/iseries/v6r1m0/index.jsp?topic=/apis/xsp_splf_list_act.htm”>UIM Spooled File User-defined List Action Exit Program</a> that was made available in i V6.1. However, it does not allow you <i>to change</i> excisting options. Rather, it allows you to create new user-defined options.