It will be helpful if we have insert table, add/delete rows or columns button on the toolbar. I have seen Radeditor toolbar for Asp.net Ajax by Telerik. It will be great if more useful buttons are added on the toolbar.
Right now we when using both server and client binding have to write all templates (and details templates) twice, I really hope you can find a way to configure them the same way. Maybe the #= syntax can be parsed on the server or maybe, even better, the t => t.Column syntax could be translated to client code?