Actually multi value parameters is not supported on WebServices source. Multi value are passed as [string1,string2] instead of $paramName=string1&paramName=string2.

Multi value has to be passed on query string on correct way!

Loading huge DB schemas in bulk is time-consuming. Add lazy schema loader for the table column definitions in order to improve the user experience when using DB with a huge schema.

Please add support for signing PDFs with a certificate stored on a hardware token, for example on a Qualifies Signature Creation Devices (QSCD) as defined by the EU law known as EIDAS, using a native platform way (on Windows this might mean through the Certificate.msc store).

Support generating reports on .NET Core running on a non-Windows platform, esp. macOS or Linux-like OS.

There is the newly introduced WebServiceDataSource which enables me to get JSON data from a web service. I'd like to be able to use JSON as a data source for a report without using a web service. For example, the JSON might be embedded inside the report definition, or it might be coming from an external text file (URI or URL), or even pass it programmatically to the report at run-time.

It would be really useful if EntityDataSouce was updated to support Entity Framework Core contexts. EF Core depends on Standard 2.0 so can run on .NET Core or the full framework.

In some cases, the data source might have dynamic columns meaning that the columns might change for different report runs. I need to be able to detect if a particular column is available using an expression so that I can handle its absence without showing an error to the end user.

It would be nice if resx files to localize the (wpf) report viewer can be placed in a specific resource path instead of the main folder of the VS project.

For example a 'Resources' folder within the 'Properties' folder of the VS project.

When the Name of a Report Parameter is changed, all references to it should be automatically change.

Add support for PDF Accessibility as described in the https://www.adobe.com/accessibility/pdf/pdf-accessibility-overview.html

First, we need the ability to have the controls in a Page Header Band to Grow/Shrink based on their contents.
Second, the Page Header Band also needs the ability to Grow/Shrink based the first Condition and any other Conditional Formatting settings of controls with in that band. 
This is request becuase of the design of the Report Header Band and how it is designed for Multi Column Reports.  The Report Header Band does all what I am asking for, however, in a Multi Column Report, it's only the size of the column width, which is a problem for some of our reports.  We need it to be the entire page width.  Some suggests to create PAGE BOOKS seems a bit complicated to do for such a simple request.  I have been using different report writes in my 25+ years of programming, and Telerik Reports is the first one that I have used, that has these limitations..

When a report contains data item bound to big amount of data, it takes time to export in CSV format due to data denormalization.
This would be a performance improvement for big data reports. 

Add intelligent code completion in the Report Designers Expression editor to improve the editor usability and user experience.

Currently, the WebSeviceDataSource is making separate request whenever data is required, consider adding a caching mechanism to reduce the number of the web requests.

One of the main features the clients require when exporting the reports to XLS or XLSX is to have the page width already set to 1 page. But for none of these exporting options, this is possible, unless you intercept somehow the export functionality prior to rendering the document to the client

I'm trying to learn more about your reporting tool, but your demo only shows me a blank page. 
https://demos.telerik.com/reporting/dashboard?&skinName=default

Please consider adding an RTF Text Box control to your report toolbar.   Crystal reports has this ability which we've used on many of our reports.  Currently the only work around for changing the RTF data to something that Telerik Reports will print cleanly, is to create a user defined custom function.

Provide a component which wraps the HTML5 Report Viewer for use in a Vue.js application. The HTML5 Report Viewer is built using Kendo UI for JQuery components. So, one can consider the approach covered here: https://laravel-news.com/vue-wrapper-component

It would be very useful to have the option of changing Sort and Toggle Visibility icons for example to a vector image. Default png is not looking good when the report is scaled or in specific styles.
Attached an example.

I reported this behavior earlier in a support ticket over two years ago but since it has not been addressed, I would try this approach.

If an AreaSeries has the LineType set to LineTypes.Smooth, the graph series may become misleading or incorrect. Consider the attached screenshot (withoutsettings.png) showing a simple 10 point chart. Looking at the chart, you would assume that between 11:06 and 11:07, the response time was below 0. However the test values indicate that the values never were below 0. This makes the chart  misleading and incorrect. It then makes the chart unreliable to the end user, thus unusable. The quick workaround is to set the LineType=straight but since you support a smooth linetype, it should be correct. Another, more serious, instance in the chart where (using smooth LineType) is where the series line will cross the  x axis point (a timeline chart) more than 1 time which is actually a timeline chart violation. (attached file AreaSmooth2.png) .