Well I do press the connecting seams flat but don't fold in half and press. Read the idea someplace on the web and the reasoning is: Depending on the thickness of the batting will determine where the half way point is. It may be off 1/8 of an inch.
Oh and I don't sew it on the front. I know. I'm really going to jail. I sew it on the back. This way I get an even binding when I do the final stitch on the front.
I just hope my quilting friends will come to my rescue when I go to trial. I'll make sure DH keeps you informed.