Machine Binding With Decorative Stitch?

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If you are using a simple stitch like the blanket stitch, sew some on an extra piece of fabric and count how many times the needle pierces the fabric and where. You might then be able to adjust by making the stitch a little smaller in one area. I've used the pin stitch in heirloom, and you have to count to turn a corner. It's nervewracking, but possible.

People who do shadow work or applique on fine garments do use decorative stitches. You might find a site for shadow or applique embroidery for heirloom and see if any of their stitch guides help. I have an old book that tells you how to adjust.