Many times just a simple stop is all needed for planing straight-ahead. It is fast and has the advantage of avoiding distortions in the piece closed between the vise and dogs, especially in the case of reduced thickness. It is not difficult to build one cutting a through mortise (1"x 1 1/2"ca.) in which a plunger slides; its section is very close to section of mortise and it's long enough to be easily adjusted by a wing nut screw system placed under the bench. One shown in the photo is the glorious Record 169, easy to fit in any work bench.