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Hi, I'm not quite sure which part you're referring to by "jumpers"... can you elaborate?

As for bi-directionality, the direction can be changed by swapping the order that the phototransistors are connected to the drive circuit. It's been a few years so I don't remember the specifics, but I think (I'm half-speculating here!) that, let's say the optosensors are labeled like this:

A B C D

Then to reverse direction, you would connect them up like this:

B A D C

where A,B have been swapped and C,D have been swapped. Practically, this could be done by adding some switches to the circuit, or it could be done in logic if you add some additional gates after the inverters in the existing schematic.