I need some way of reading which item is currently passing through a pipe.
Would it be possible to add a method like getItem(...) to IItemInjectable or some new interface?

Another minor thing: Would it be possible to add a method to the IShifter to enable it without requiring it to have a redstone signal? Or would this require too much changes to the code?

1. An official item detection method is coming (sometime after I finish gates, as the detection system could benefit from a good redstone backend) - I will look into an API method for it then.
2. The IShifter? It doesn't have to have a redstone signal. In fact, the code never checks if it has a redstone signal - isShifting() serves that purpose.

Tell me if this API works - I'm not exactly sure.

(For detectors, you most likely want to keep the EnumFacing as null and check the center.)

Ok, will check.

Seems to work just fine!