In the same way that ASP.NET MVC wrappers are supported...

Currently, if a RadWindow is maximized, then minimized, then restored it will get the dimensions it had before maximizing. A window in the OS will maximize if it had been maximized prior to minimizing and the RadWindow should have the same behavior.

At present, when a Telerik product is installed via an automated installer (WebInstaller or a downloaded MSI package), a shortcut to it is added on the desktop.

This feature should be optional, e.g., via a checkbox during the installation wizard.

Such functionality would improve the user experience for UI interaction of the end-users with the RadEditor tools.

Such behavior can be achieved using the following customization with the RadEditor control:

<telerik:RadEditor ID="RadEditor1" runat="server" OnClientLoad="OnClientLoad">
</telerik:RadEditor>
<script>
    function OnClientLoad(editor, args) {
        editor.attachEventHandler("onkeyup", function (e) {
            if (e.keyCode == 27)
            {
                closeContextMenus(editor.get_toolAdapter()._contextMenus);
            }
        })
    }

    function closeContextMenus(contextMenus) {
        for (var menu in contextMenus) {
            contextMenus[menu].hide();
        }
    }
</script>

Button single click becomes disabled permanently if a validation error is detected. After satisfying the validator conditions the button doesn't get enabled and it is not possible to post back the page.

I don't know what you call this button but it is a crossover between a drop down list/mega menu and a button.

Very simple example:
Google's "More" button across the top next to News/Videos/Maps and then there is the "More" button with the other options. 
https://www.google.com/#q=dog

Next example:
Your site! The skin selecting drop down:
http://demos.telerik.com/aspnet-ajax/grid/examples/overview/defaultcs.aspx

The option for a full fluid width like this would be nice along with the possibility of a fixed or fitted width. I also really like the animated arrow up/down.

But the mega menu example is Amazon:
http://www.amazon.com/

Their buttons/drop downs in the top right for "Your Account", "Try Prime", "Cart", and "Wish List".

These are beautiful and would be great functionality. It would also be ideal if the button/link itself that triggers the drop down doesn't have styles like the skins so they can easily be integrated into a website's existing navigational items and site design.