It gets tiresome having to maximize my floating Library every time I open it up as a floating window. I like to have it maximized because I can see all the columns better that way. In fact, I usually use floating windows in their maximized size (e.g., for Help as well). Then I use Alt+Tab to toggle back and forth between seeing them and seeing the rest of the Logos layout.
If I close a maximized floating window, I would like Logos to remember that it was maximized and open it back up maximized the next time. I'd want this to work alongside and completely independently from Layouts. In other words, I know I can save a layout with a mazimized floating window in it. But often I like to temporarily open up a floating window, maximize it so it's useful to me, and close it again because I've got too many windows open. But next time I open it again in that Logos session, I still want it to be maximized.
Actually, this would apply if I'd resized a panel, too. If I open Hilighting in a floating window and then resize it to be narrow like it should be and then close it. I'd want that fact remembered about the Hilighting panel so that next time I opened it indepently from a saved layout, it would be the right size for me.
That means that each panel type would need to have a "saved size for new floating window" stored somewhere, because your preferred size for that new floating window would likely be different depending on the panel type.