There is no predefined parameter for PS_OPR_ID password. However, you may want to log this as enhancement request.
To log an enhancement request for this feature, please visit the Stat Community Idea portal at http://communities.quest.com/community/stat?view=idea. This area of the Stat community is dedicated to tracking customer enhancement requests and allowing the community to discuss usecases and vote on the most useful features for consideration in future releases. Once you get to this page mouse click on "Login" link on top. If you do not have a login mouse click on "Register" link on top and fill in the requested information.