The other day I decided to look at the manual and actually use the 1/4" quilting foot which was provided with my Brother sewing machine.
If you line up the fabric to the marks and start/stop at the right place, not only do you get a 1/4" seam allowance along the edge, it also starts and stops 1/4" in from the ends of the fabric. This means that when you are sewing cross joins, the back of the block ends up looking like it does when you hand quilt, and leaves less of a bump when it's pressed.
This also has the effect of producing perfectly matched seams on the front side!!
I don't know why I didn't try this before! It just goes to show that these things are included with the machine for a reason. I'm going to use this foot for all my quilts from now on, because it's not like it's hard to change the presser foot before sewing. My poor industrial machine is having less and less uses. I need to do more garment construction because he's brilliant at that.