The behaviour I described was true, what Hanai pointed out is also true and more accurate in that you can edit the job in the Request queue and add the #NOX card just prior to the first job step. What I found that didn't work was following the manual description about adding it just after the Jobcard. CA7 inserts a couple of comment lines as shown below (UCC7RESTART card and the library the JCL was fetched from, so in that case I got it to work by not putting the #NOX card after the Jobcard, but after the comments as well. Thanks to Hanai for clarifying.
//TC7BR14 JOB (C7T,$MAINT,9000),'IEFBR14-BRANCH',
// CLASS=8,MSGCLASS=T,USER=C7DBMTC
//*UCC7RESTART
//*JCLLIB=TSTC7.JCLLIB
//JS000010 EXEC PGM=IEFBR14
//SYSWAIT EXEC PGM=SYSWAIT,PARM='00001000'