I find it just as easy to use the accessory rip fence with the saw off the rail and reference off the stock itself. You won't get the straight-line rip the rail will give you but that may not be desirable anyway when ripping dimensional lumber, as you probably need parallel stock, especially if the off-cut is the piece you want to use. Just don't forget to allow for the kerf. One benefit to this is that your saw is balanced directly on the stock and the relatively narrow perch isn't such a big deal as it would be under the rail.