I am afraid that currently we use English as the only language for communication with clients.
Also, I am not sure what do you mean by "manually set scrolling so that the scroll bar does not calculate the rows showing verses total rows", but there are two ways to set RadGrid height when scrolling is enabled:
In the first case RadGrid calculates the height of the scrollable area, so that the total height of the control (including header, pager, etc) is as much as specified. In the second case, the RadGrid does not calculate any heights and the control does not flicker on initial page load.
If you need more information, please provide a simple runnable web page, which shows your implementation.
the Telerik team