1. We are aware of this problem in IE6. We did try our best to fix it for today, however other issues came up. We will do our best to fix it for some of our next updates of the control.
2. You can use the following approach to get the position of RadDock client-side:
var dock = $find('<%= Raddock1.ClientID%>');
var docklocation = Sys.UI.DomElement.getLocation(dock.get_element());
alert(docklocation.x + ", " + docklocation.y);
the Telerik team