Controller on Steam PC for Mass Effect Legendary

If anyone is still having this problem, this is how I overcome it.

When you get to the Mass Effect title screen that says "Press Any Button" and no buttons work, hold down the "steam" button and press a trigger (simulates mouse click.) From there, the controller is magically recognized. Your mileage may vary, but this was the only thing that worked for me after trying every other "fix" I could find.