2.55 alpha 51 which is the latest with the Classic Module.
Like on the "Stairs" combo type for instance, it includes (R) as random, but "Cave Walk up/down" combo type, Side Warps doesn't include the random warp type. You go to side warp panel, click on one of the four black rectangles, as you cycle through the A, B, C and D warp destinations, you'll see that it doesn't include the "R" after the D for random side warp destination.