As an OPTS parameter, you can give parameters that the actual Certificate Validator binary accepts (described in detail in ssh-certd Options). For example:
===> S SSHCERTD,OPTS='-d 9'
To set options for starting the Certificate Validator in ISPF, enter the Tectia SSH Assistant option 4.2.7 TCRTOP.
The available options are described in detail in ssh-certd Options.