1. The toolbar is not part of RadPdfViewer. The toolbar used in the demos is a RadToolBar with RadButtons. The buttons are using commands in order to execute the functionality they are responsible for. All commands that are supported by RadPdfViewer can be found in the Commands property of the control.
2. Currently, the only way to change the look of the scroll bars is to override the control template of RadPdfViewer. However, if it will fit your needs we can expose properties for Horizontal and Vertical scroll bar in order to change their style without changing the control template.
3. In the upcoming SP2, expected in less than a week, RadPdfViewer will have basic touch support (zooming and panning).
We are hoping that this answer your questions.
the Telerik team