The Web Report Designer's current layout is not flexible and cannot be customized. It will be useful to allow changes in the designer template, styles, etc.
For example, in some scenarios, the users should not be allowed to add DataSources to the report. In this case, the DataSources components should be hidden or disabled, which currently can be achieved with custom jQuery code.
In other scenarios, it may be necessary to change the styles of the designer elements.
It will be useful for the designer to expose also events.