Quote from DrakBadgerwaffles
I can manually do this for you. It would be a whole tutorial on how to do it if I were to tell you, but if you can send me the follwoing I will switch it over for you.
- The map file you wish to convert to a cheat mode version.
- The seed of the same map.
NOTE: If given the wrong seed, I guarantee you it will not work. And if the seed roamed (randomly seeds can switch themselves) I cannot help you.
Quote from KuroiNox
You could use NBTExplorer and manually allow cheats to be activated and stuff.