But that was such an appauling sentance, it was worth mentioning twice!
I would suggest that if it is out of warranty, when you put it in for a service tell them it has been remapped and not to re-flash the ECU. I don't believe that would be done as a matter of course anyway. But as already said, I know Revo can be switched back on (not sure about other remaps but can't imagine they would be too different) or in the worst case scenario, go back with you receipt and the Revo dealer should sort it out for you.