How can I make a public screen?

[Ral-Clan]

Is there any way for the average end-user (i.e. non programmer type) to have AmigaOS create a "blank" public screen in a specified screenmode that is available to Workbench?

I'm trying to do a work-around.  I have an application that for some reason won't allow me to choose the screenmode of 1920x1080, even though this screenmode is available to Workbench and many other apps.  Normally this app can "see" all available screenmodes, but not this time for some quirky reason.

However, this app will open on the Workbench screen in 1920x1080 just fine.  But I don't want it to open on Workbench.  I want it on its own screen.

Since this app also gives me the option to open on any available public screen, I was thinking that if there was some way for me to create a vacant public screen at 1920x1080, I could just tell the app to open on that screen.  

A bit of a work-around.

[Ral-Clan]

With ModePro you can define public screens which automatically open when a program requests the name.

I'd rather not do it this way (force the app to run on a public screen via screen-promotion).  The app is smart enough to open on a specified public screen that already exists (there is an option in the app's settings to open on an available public screen).  So I'd rather open the public screen, THEN start the app and tell it to go over to the public screen.