I stand by my comment that the immobiliser can't be disabled, it can be bypassed so the engine ECU doesn't need to see the correct code from the BeCM, but it is still there and still enabled. It just doesn't affect the starting and running of the car. Too many people think that when they go into the BeCM with their Nanocom and see the entry marked Immobiliser and change it from Enabled to Disabled, that is it, they have switched it off when all they have actually done is turned off Passive Immobilisation. The same goes for the EKA setting. Changing that from Enabled to Disabled doesn't mean you won't need to use the EKA, it means it won't ask for it when it is needed.
I wouldn't go as far as saying I don't approve of it, I just don't see the need for it. If the car is immobilised, you just put the EKA in (either with the Nano or with the key), that is all that is needed until you find one of the microswitches in the latch has failed but there are ways around that anyway. Mark Adams at Tornado Systems has done a stand alone GEMS ECU for years, primarily so owners of Morgans, TVRs and specials without a BeCM can remove the old 3.9 Classic engine with 14CUX injection but a conventional distributor, and fit the later GEMS engines into them.
No, there is no transponder in the key, just the remote transmitter, so other than needing the EKA initially, a cut key blade will work fine.
Harv must have had some sort of mod done as you can enter the EKA with the Nanocom and then lock and unlock with the key without needing the EKA but that is cancelled as soon as it is locked with the remote so the EKA should be needed again.