I'm struggling to create an action that can do the following: when I right click on a selection I want an option to add the files to a zip and have it password protected with a default (i.e. static) password. I do not want the dialog box to pop up and ask me to enter the password.
It's not a great workaround, but one possibility to make the process slightly easier is to use the Clipboard SET command in the same button to put the password into the clipboard so you can paste it into the dialog.
Another possibility would be using something like Keepass Password Safe that lets you store passwords that you can tell it to auto-type when you push a hotkey with a particular window open. That still isn't great, though.
Of course, you could create an Opus button which runs a 3rd party command-line zip tool. That's probably the only way to get a "one-click" solution at the moment, but there's no harm asking GPSoftware to consider adding the feature if you need it.