I use Elmer's washable school glue (the liquid) to match seams when it's really important to be accurate. Works great! I put a pin straight through both seam allowances to get the seam matched well, then put a small dot of glue inside the seam near the pin and iron to set. It holds the seams together well, with no pins to remove while I sew.
I don't think the glue stick would work as well for this particular use since it would be hard to get the glue right up to the pin for accuracy. A glue stick might work well for binding; haven't tried it, though.