Show a navigation window for navigating between panes when the user presses Ctrl+tab. 

RadDock for WinForms has such feature: https://docs.telerik.com/devtools/winforms/dock/architecture-and-features/quick-navigator

Closing a RadPane in the DocumentHost should focus the last selected pane instead of the first one(as in VS)

This happens when primary monitor is with lower resolution. Maximize the pane on the primary monitor, then maximize it to the second monitor - the maximized state is incorrect.

When a pane is unpinned, mouse over it in order to show. After that when the mouse is removed from the pane it flickers before the animation is started.

Yes please!

Add overloads for LoadLayout and SaveLayout methods of the Docking control with parameter of type XElement instead of Stream. Change the Save/Load layout code to use LinqToXML instead of XmlReader and XmlWriter.

Add shortcuts like:
- close a pane by mousewheel click on the tab
- close the active pane by keyboard shortcut (e.g. Ctrl + W)
- switch active pane by Ctrl + Tab

In the following scenario:

    Floating Pane's size has been changed.
    The layout has been saved.
    The layout has been loaded.
    The Pane has been docked.
    Making the Pane floating should retain the custom size from point 1.

Support the nesting of a RadDocking control in RadPane or other RadDocking control.