I think others are right. I don't think the Parallel Guides are the right solution. I guess I don't see what's wrong with what you are currently doing. For me, the fastest and most accurate way to rip a board to final width is on a table saw with a high quality combination blade that leaves a smooth edge. Once the board is jointed on one edge and face, then planed to thickness, I almost always use a table saw to rip it to the right width (sometimes with one pass over the jointer to be sure it's smooth). Then, I cut the board to it's final length using my TS55 and MFT with the fence and guide rail. I know the fence/miter gauge isn't the most popular part of the system around here, but it works for me and the result is a perfectly square cut. So crosscutting to the final length is the last step for me.