My machine doesn't have that feature (unfortunately). It is a recently-resuscitated, 70's Montgomery Wards machine that sews like a dream. It is a real work horse and I love it, but am still learning how to get the best 1/4 seam for piecing. (I think I'm zeroing in on it.)
On the other hand, I am learning how to "square-up" stuff as I go - which is valuable in itself. Below is an example of how far off i've been (the block should have been 9.5" - like the pieces I'm trimming).