As of the latest Reporting release the JavaScript size to download went from 61K to over 2MB. Our users work for charities and often have slow network connections. This is not an acceptable change for us.

There is currently an option for GroupKeepTogether of FirstDetail for the Group, which keeps the Group Header with the first line of the Detail section.
This option needs to be duplicated for the Group Header and the Group Footer.
The Group Footer would contain an option to keep with first detail and the Group Footer would have an option to keep with last detail.

In the development of a form which prints over multiple pages, the only way to ensure page breaks occur where desired is to use multiple Groups, with only the Group Headers Visible.
It would be more logical to be able to insert multiple Detail Sections, with each on their on page. Another option may be to insert a page break within the Detail Section.

Add the ability to either specify the number of Columns in a Table during creation or allow a entered number of Columns to be added after creation.
Both would be my favored solution.
Creating a Table with numerous Columns is tedious when you have to add one at a time.

When a date is set as a report parameter in the HTML5 viewer, it formats the parameter as a JSON date using a timezone.  Where no time is specified this results in a time part added to the date when received at the server.  This is a problem, especially for browser in a negative offset zone, e.g. US, where upon the date goes to the previous day.  Please add support for parameter types of date, where no time is present and no conversion is done anywhere.

The standalone designer throws an error, e.g. "Missing operator before", if you make a mistake in the conditionalFormatting expression and close the expression editor.  You are then unable to correct the mistake without opening the trdx in a text editor.  Please change the behaviour so that the editor can still be opened even if the expression has syntax errors.

Datadynamics was purchased by GrapeCity some 4 years ago but Telerik Reporting is still relying on the old assemblies for converting.  The converter needs to be updated and should support rdx as well as codebehind files.  I was able to convert the Telerik.ReportConverter.ActiveReports to use ActiveReports 7 but am not able to use the modified dll.  See attached.

Add the functionality of the Page Up/Down as well as Home and End to the WPF Viewer Control, so that the displayed page may be controlled using the keyboard.
These buttons should also work with the CTRL+ variations.

I had compare crystal report and Telerik report on rendering similar dataset. (LARGE dataset)
Crystal report renders much faster on showing the initial page (viewer) by almost 50% compare to Telerik html5 viewer. (almost 10,000 pages)
Crystal report renders much faster on generating PDF file by also 50%.
Also Crystal report telling the total page on the initial rendered page., while on Telerik report (html5 viewer) it on shows pages that are already cache (and show caching progress.) It would be nice if it show the total pages then shows in the status notification the progress of caching.

Add the ability to control the relative position of text in relation to the image for both Radio & Check Boxes, such as TextImageRelation property used on your WinForms Radio & Check Boxes.
This would allow the following options: Overlay, ImageAboveText, TextAboveImage, ImageBeforeText, & TextBeforeImage.

The order of the items in the Border Style Properties should be changed such that Solid is the second item in the list, after None, as this is the most frequent option. This would allow the Border Style to be changed to Solid with a double-click.

On opening the Expression Editor, if at least one Data Source is present on the Report, then the Fields item in the tree should automatically be selected. If no Data Sources are present on the Report, then the default selection should be the Report Parameters.

The ability to use static values and display members as an array for a multi value parameter. I want my team to be able to use the standalone report designer without a custom User Function or a data source. We had been using SSRS and made a switch to Telerik, and this seems to be the only hangup that we are unable to convert cleanly.

In the standalone designer, it would be helpful if you could drag and drop the column headers to reorder.  At present you have to add a new column and delete the old one, remembering to copy all properties.

Please add a new ZoomMode to stretch the report to the viewer's visible area 

It would be useful to have tooltips to graph series  so we can explain what each Series is showing.

It's currently not possible to define in the HTML5 Report Viewer "per Report" the available Export formats. It's also not possible to alter the List in the given JS Events because the List of PDF,XLS,etc is loaded on MouseOver in the menu.

Would be great to have some kind of options, array list in the widget options to define what export formats are displayed.

Kind regards, Otto.

It would be useful to have tooltips to table header columns so we can explain what each column is showing.

Add the ability to specify rounded corners for the border of TextBoxes, Pictures, Tables and all other similar controls.

Allow custom buttons and other controls to be added to the existing ReportViewer Control Toolbar.