I try to tell myself that a 1/4" seam is a 1/4" seam no matter how much or how little fabric there is on the other side. But I start feeling pretty clumsy after about a 2" cut. One of my issues with the Bonnie Hunter Mysteries (other than why so many triangles!) is I just don't think a 1" finished square is really appropriate for the size of a queen+ sized quilt.
My solution to accuracy is cutting large and trimming down anyway. I wouldn't be doing this sort of thing on $12 a yard fabric, but from my stash and if I'm working on scraps, if it makes me feel less clumsy and is quicker/easier, and I'm not going to be able to use my trimmings anyway, yeah -- why not take two 2.5" jelly roll strips, sew them down the middle and then trim them to the correct width. even if you are trimming off an inch or 3/4". Always remember your seam allowance!