Interesting, my wifes ex races bmw minis and has had someone do a similar thing so he can use a competition ecu to control the engine without loosing all the other cars electrics.
I can see the point in this, fiddling around with software for 12 months just in case the same firework people come back, you'd be unlucky, but I spose it could happen.
But not if your using zip wire, if you were really paranoid you could sense impedance changes in case there was some tampering, then theres security protocols that use rolling codes, microchip do a couple, but now were getting ott.