Drill Through from Total Line

My workaround is to turn the table into a matrix and then add a top-level group (eg if I my original first column was UK regions such as North, Central, South West etc, then I'd create a new first column called 'Country' and populate the rows with 'UK' or 'England' etc). I'll then add the +/- option in the matrix formatter so that when the matrix is collapsed to England/UK people can then drill through. I also ensure that my drill through page (usually a table of the entire dataset) has similar filters so that people can just use this page to get to the information they need - perhaps in combination with sync slicers. I'll vote up the option to drill through on the total line though as it's more convenient and intuitive.