I had some success using physical % complete to calculate earned value. I switched the this in the task information box in the advanced tab. I then had to re-baseline the task and then enter the physical % complete.
I was able to see some values for tasks that occur in the future in the BCWP column. However this method did not work for every future task and the BCWP column does not always recalculate when updates to the physical % complete are made.