I guess that having an ID in the grid *without* adding it a a column would be a feature request. I do not mind having the column in the html myself, but it would be nicer (ofcourse) to be able to specify coulmns without adding them in the html code.
You could try to ask the Telerik guys to add this to the feature list, so we could all benefit from this.
As a sidenote, this code exposes an OnDoubleClicked event on the grid which is not yet incorporated in the grids code. I posted the changes necessary to another forum post: Double click added to grid