The 1/4" seam drives me crazy since I switched from my Pfaff to the Juki. The juki does not have a presser foot with a guide. I just ordered a high shank foot with a 1/4 inch guide and hope this will do the trick.
The problem I find with the Juki foot is that it is too narrow. That makes the magnetic seam guide less accurate. I'm keeping my fingers crossed for the new foot.
I'm currently doing the 52 women of the bible quilt. The blocks are constructed with different techniques that makes it absolutely essential to keep the scant 1/4" allowance.