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The ECU supplies and determines all timing of spill valve and injection, the box underhood commands the spill valve and works as a peak and hold driver (albeit @ 90-100v) for the injectors.
There is no cam signal going directly to this box, and any timing value that wasn't the drivers side intake cam would be useless anyway, as that cam has the 3-lobe pump drive on it. It is also important to remember that since it is 3 lobe it doesn't time well to the injection events, and if you ever exceed 60 degrees of open time (cam) or varies by more than 60 degrees (cam) timing, you need to reconsider your thoughts on the ability of the pump to work whilst injectors are open.
I do have a pump disassembled on my desk...they fixed some issues from audi's pumps, but also cheapened it up a bit, I found the crickets too lol....
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