The quickest way that I can think of to do this is to set the grid.DisplayLayout.Override.RowEditTemplateUIType property to None so that you can manually determine when it should be shown. You can then use the ClickCell event (available in the 9.1 release, I think) to show the template depending on if it's the column that you want:
private void ultraGrid1_ClickCell(object sender, ClickCellEventArgs e){ if (e.Cell.Column.Key == "Column 1") e.Cell.Row.ShowEditTemplate();}
-Matt