I thought that's all anyone really wants? Not directly driving the injectors, but.. the DME controlling the controller I guess? So it can be actively aware one way or another as to PI Flowing.PI sadly will never be controlled directly by the stock DME because the MSD81 just doesn't have the mosfets / hardware to drive the injectors. That doesn't mean a better PI controller / intermediate box could not be built with DME integration, giving the same end result
As for the other 3 items, I don't see why they would not be possible.