This would definitely be a great addition to the views. Whil that happens, I deviced a way to mimick the stacked area charts which you might find handy.
If you have 2 (or more) columns, say ColumnA and ColumnB to stack on top of each other, please create a formulae field ColumnC = ColumnA + ColumnB. Then de-pivot to have ColumnA and ColumnC as a category field and the corresponding values in the value field. If you now map these two columns in a normal graph view, you will get the desired effect.