The provided by default parameters templates and way of handling are considered with the possible target browsers - mobile and desktop, and the need of responsive layout regardless the device.
The HTML5 Report Viewer
comes with templates that can be edited to conform custom requirements as well. Also the HTML/CSS/JS nature of the viewer allows more flexible incorporation with custom UI, even without modifying the viewer's templates.
Let us know your concerns regarding report parameters, so we can advise you accordingly.
New HTML5/JS REPORT VIEWER with MOBILE AND TOUCH SUPPORT available in Telerik Reporting Q3 2013! Get the new Reporting version from your account or download a trial.