When setting ResourceMarkerType to "Bar" or "Block" on the AgendaView mode of the Scheduler, it would be useful if the marker would show the background and border colors that were specified in the ResourceStyleMapping section of the scheduler.
As it is now, it only takes the css class that was assigned to the resource type.
In our application the user can specify any color for each resource type using a colorpicker.

When the start date of a series is changed, the exceptions from the series (like when deleting an occurrence) are moved along with the series. This is not always the expected behavior, because in some cases the exceptions should stay in place (because they are holidays for example). It is also an issue because the users don't understand why some exceptions have disappeared, or why other exceptions have appeared.
I would suggest that the end user be presented with an option to: keep the exceptions in place, move the exceptions or delete the exceptions (like Outlook does) when he changes the start date.
If the exceptions should be handled the same way always, the developer could specify the handling way, and then the user would not be alerted.

Feature Request: Add the ability to RadScheduler to set start and end time for each day-of-week and off days for a week, month, year. 

Serverside and Clientside.

To have a HeaderCreated option for the RadScheduler to allow you to customise the header in timeline view.

Please add holiday functionality to RadScheduler - for ASP.NET Ajax, similar like you did for WinForms. Thanks!

Hover over the command arrows on the radScheduler when the view is set to month view.  The Tooltip will display "next day" and "previous day" instead of "next month" and "previous month".

The same happens for week view.

Temporary workaround: 

<telerik:RadCodeBlock runat="server">
    <script>
        function pageLoadHandler() {
            var scheduler = $find("<%= RadScheduler1.ClientID %>");
            var $scheduler = $telerik.$(scheduler.get_element());
            var viewType = "Day";
            if (scheduler.get_selectedView() == Telerik.Web.UI.SchedulerViewType.WeekView) {
                viewType = "Week";
            } else if (scheduler.get_selectedView() == Telerik.Web.UI.SchedulerViewType.MonthView) {
                viewType = "Month";
            }

            $scheduler.find(".rsPrevDay").attr("title", "Previous " + viewType)
            $scheduler.find(".rsNextDay").attr("title", "Next " + viewType)

            // Sys.Application.remove_load(pageLoadHandler);  
        }
        Sys.Application.add_load(pageLoadHandler);
    </script>
</telerik:RadCodeBlock>

Currently, the RadScheduler does not have WAI-ARIA support: 

• https://docs.telerik.com/devtools/aspnet-ajax/controls/wai-aria-support-and-screen-readers;

I'm using RadScheduler in a page that is called with a script "windows.open" but does not pop up. As is shown in IE6 or IE7 displays correctly but when running in IE9 is very compressed cells. In this control only use the view of "time-line" because I am trying to show the availability of people going to invite a date. Can you help me with this bug?

Extend RADScheduler not just to creating appointment. Extend it to be timelogging\time clocking feature where user can use RADScheduler to perform timelogging\clocking. 
Also allows copy and paste from 1 day to another day.