TL;DR: A fence should become active when it unrolls and restore previous z-order when it rolls up. Is this possible?
Setting aside if its even possible to get icons at a presentable top z-order (above open apps), its also that we believe the feature request - as it has been described often here - would not be as practical as people think it might. It's not to say the idea \ use-case is not sound - quick easy access to desktop assets from anywhere - it very much is.
There is another idea we have on the table that would be cleaner and reach the same goals. I cant say that it will, or will not, make it to any new version but I did want to affirm that we get what you want.
Again, thanks for the feedback.
Stardock Support Manager